OFFICIAL EXPLANATION
The town has a park, a fountain, and is considered a tourist destination.A. park, a fountain, and is considered
This answer choice is grammatically incorrect. The list in the original sentence contains items that parallel each other in neither part of speech nor logic. The nouns park and fountain do not parallel the verb is (considered).
What helps us identify this question as a Parallelism question as well as identify the mistake is the following Stop Sign: A list of 3 items or more, separated by commas and and/or before the last item.B. park, a fountain, and is considered to be
This answer choice repeats the original mistake. The list in the original sentence contains items that parallel each other in neither part of speech nor logic. The nouns park and fountain do not parallel the verb is (considered).
Also, this answer choice is stylistically inferior to the original sentence. Adding to be after considered is redundant.C. park and a fountain and is considered
This answer choice corrects the Parallelism error of the original sentence by creating two lists. The first consists of two items, both nouns: a park and a fountain. The second list also consists of two items, both conjugated verbs: has and is.D. park and a fountain and is considered to be
While this answer choice corrects the Parallelism error of the original sentence and is grammatically correct, it is stylistically ineffective. Adding to be after considered is redundant.
It is true that stylistic mistakes aren't always corrected. However, in this case there is a grammatically correct answer choice that corrects the stylistic mistake (i.e., is more concise than this answer choice). Look for it! E. park, a fountain, and it is considered
This answer choice is illogical. It divides the question into two sentences that are connected by the conjunction and:
The town has a park, a fountain, and it is considered a tourist destination.
The first sentence contains a list of two items - the nouns park and fountain. The rule for a list is that the word and/or should appear before the last item on the list.