Sentence Correction: Pronoun Questions - The word/term

The term "intellectual property", which, ever since the spread of the internet, has become widely used, is a legal field dealing with creations of the mind such as musical, literary, and artistic works; inventions; and symbols, names, images, and designs used in commerce, including copyrights, trademarks, patents and related rights. 

Excellent!

This answer choice corrects the logical mistake in the original sentence, by replacing the verb is with the verb describes. 

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Incorrect.

This answer choice repeats the original  logic mistake. The intent of the sentence is to define the term "intellectual property". The term itself is not a legal field - the term defines or describes this field.

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Note that stylistically, this answer choice is better than the original sentence because it is more concise (prevalent vs. widely used). However, grammatical correctness and logic  override style. The correct answer choice to a Sentence Correction question can be redundant or otherwise stylistically flawed, but it can never be illogical or grammatically incorrect. 

Incorrect.

While this answer choice corrects the original mistake, it creates a Subject Verb Agreement mistake by replacing the singular verb is with the plural verb describe.

Incorrect.

This answer choice repeats the original logic mistake. The intent of the sentence is to define the term "intellectual property". The term itself is not a legal field - the term defines or describes this field. 

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Furthermore, this answer choice is stylistically flawed. Changing such as to as creates an awkward construction. 

Incorrect.

This answer choice is illogical. The intent of the sentence is to define the term "intellectual property". The term itself is not a legal field - the term defines or describes this field. 

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widely used, is a legal field dealing with creations of the mind such

prevalent, is a legal field dealing with creations of the mind

widely used, describe a legal field that refers to creations of the mind such

prevalent, is a legal field dealing to creations of the mind such

widely used, describes a legal field that refers to creations of the mind such

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