The correct verb usage in the given sentence should be "is". Thus, option (A) is correct.
What is Subject?
In English grammar, Subject refers to the Doer of the action, It is that part of the sentence which generally comes in the starting of the sentence and indicates who is performing the action and what it is about.
Generally, a sentence has the subject along with the object. The best way to identify a sentence's subject is to transform it into a yes-or-no question, where "yes" or "no" is the only acceptable response.
Verb is those words that perform the action. There are other types of the verb which help in the completion of the sentence and often referred to as Helping Verbs.
Therefore, it can be concluded that words like Either ... or… And Neither… nor takes the singular verbs.
Hence, option (A) is correct.
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