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Sentence Correction: Parallelism - (n)either A (n)or B

The Agriculture minister plans to either visit Indonesia or Thailand next year.  

Incorrect.

This answer choice is grammatically incorrect. The same part of speech that follows either must also follow or. Either is followed by the verb visit. Or, however, is followed by the noun Thailand

[[snippet]]

Incorrect.

This answer choice repeats the original mistake. The same part of speech that follows either must also follow or. Either is followed by the noun Indonesia. Or, however, is followed by the verb visit

Correct!

The same part of speech that follows either must also follow or. In this answer choice, both either and or are followed by a noun: either is followed by the noun Indonesia, and or is followed by the noun Thailand

Incorrect.

While this answer choice corrects the original Parallelism mistake, it is stylistically flawed. Repeating the verb visit creates redundancy.

It is true that stylistic mistakes are not always corrected. However, since there is another grammatically correct  answer choice that is also more concise than this one, it is preferable. Look for it!

Incorrect.

This answer choice repeats the original mistake. The same part of speech that follows either must also follow or. Either is followed by the preposition to. Or, however, is followed by the noun Thailand

[[snippet]]
to either visit Indonesia or
to visit either Indonesia or visit
to visit either Indonesia or
to either visit Indonesia or visit
either to visit Indonesia or