Select the most appropriate option that can substitute the highlighted segment in the given sentence.
The shopkeeper either offered to exchange the goods or refund the money.

Correct option is A

The correlative conjunction “either...or” must balance parallel grammatical structures. In the original sentence, “The shopkeeper either offered to exchange the goods or refund the money,” the word “either” is placed before “offered,” which makes the two parts (“offered to exchange the goods” and “refund the money”) grammatically uneven. By shifting it to “offered either to,” the conjunction now directly introduces the first infinitive phrase, giving a clear parallel: “either to exchange the goods or (to) refund the money.” In exam grammar, the missing “to” before “refund” is treated as understood, and the focus is on correctly placing “either” before the first alternative.

Grammatical rule used:
In correlative conjunctions (either…or, neither…nor), the elements that follow must be grammatically equal and the correlative word (either/neither) should be placed immediately before the first of the two parallel elements.

Example:
Correct – She decided either to study or to work.
Incorrect – She decided either to study or work.