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 correct substitution of the highlighted words is (a) The shopkeeper offered either to.
Explanation: The correlative conjunction “either...or” must balance parallel grammatical structures. The structure “ either to exchange... or refund” is incorrect because the verb “to” is missing in the second clause. So, we must start with " offered either to" to maintain parallelism.
Grammatical rule used:
In correlative conjunctions (either…or, neither…nor), the elements that follow must be grammatically equal.
Example:
Correct – She decided either to study or to work.
Incorrect – She decided either to study or work.