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Sentence Correction: Parts of Speech - Adjective

There are a practical unlimited number of air routes, but they are denser over the North Atlantic, inside North America and Europe, and over the North Pacific.

Incorrect.

This answer choice repeats the original logical mistake: the adjective practical which means 'useful', cannot logically describe unlimited number (it's not the unlimited number of air routes which is practical). 

In addition, this answer choice changes the meaning of the original sentence by replacing denser with dense

You're right!

This answer choice corrects the original logical mistake, by changing the adjective practical to the adverb practically. In this context, practically is an idiom that means "almost", or "in effect, virtually", and in this usage it creates a logical sentence.

Incorrect.

While this answer choice corrects the original logical mistake, by changing the adjective practical to the adverb practically it also changes the meaning of the original sentence by replacing denser with dense.

Incorrect.

This answer choice is illogical. The adjective practical, which means 'useful', cannot logically describe unlimited number (it's not the unlimited number of air routes which is practical). 

Incorrect.

This answer choice repeats the original logical mistake: the adjective practical which means 'useful', cannot logically describe unlimited number (it's not the unlimited number of air routes which is practical). 

practical unlimited number of air routes, but they are denser over
practically unlimited number of air routes, but they are dense over
practical unlimited number of air routes, which are denser over
practical unlimited number of air routes, but they are dense over
practically unlimited number of air routes, but they are denser above