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Sentence Correction: Subject Verb Agreement - X of Y Subject

Even though a set of 79 inflatable pontoons, due to be completed in 2011, is being developed to protect the city of Venice in Northern Italy from rising tides, still this form of solution will only be effective for 100 years.

This answer choice is stylistically flawed. Using two opposition conjunctions (Even though and still) to express the relation between two parts of a sentence is redundant since it unnecessarily lengthens it.

This answer choice is stylistically flawed and repeats the original Redundancy error. Using two opposition conjunctions (Even though and still) to express the relation between two parts of a sentence is redundant since it unnecessarily lengthens it..

Although this answer choice corrects the original Redundancy error by using only one opposition conjunction (yet), it is grammatically incorrect.

A set of 79 inflatable pontoons is an X of Y subject. In such cases, the verb should agree with X (a set), which is singular. However, the verb are is plural

What helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is the following Stop Sign:

The subject is in the form of X of Y

Although this answer choice corrects the original Redundancy error by using only one opposition conjunction (Even though), it is grammatically incorrect.

A set of 79 inflatable pontoons is an X of Y subject. In such cases, the verb should agree with X (a set), which is singular. However, the verb are is plural

What helps us identify this question as a Subject Verb Agreement question as well as identify this mistake is the following Stop Sign:

The subject is in the form of X of Y

Keep that up!

Using two opposition conjunctions (Even though and still) to express the relation between two parts of a sentence is redundant since it unnecessarily lengthens it. This answer choice eliminates the redundancy by using only one opposition conjunction (although). It also matches the singular X of Y subject (set of 79 inflatable pontoons) with the singular verb is.

Even though a set of 79 inflatable pontoons, due to be completed in 2011, is being developed to protect the city of Venice in Northern Italy from rising tides, still this form of solution will only be effective for 100 years
Even though a set of 79 inflatable pontoons is being developed to protect the city of Venice in Northern Italy from rising tides, and is due to be completed in 2011, still this form of solution will only be effective for 100 years
Due to be completed in 2011, a set of 79 inflatable pontoons are being developed to protect the city of Venice in Northern Italy from rising tides yet this form of solution will only be effective for 100 years
Even though a set of 79 inflatable pontoons, due to be completed in 2011, are being developed to protect the city of Venice in Northern Italy from rising tides, this form of solution will only be effective for 100 years
Due to be completed in 2011, a set of 79 inflatable pontoons is being developed to protect the city of Venice in Northern Italy from rising tides although this form of solution will be effective for 100 years only