Correct option is C
Option (c) contains an error. The sentence uses "Either Sam or Ishita" as the subject, which is a compound subject joined by "or." When subjects are joined by "or," the verb agrees with the subject closer to it. In this case, "Ishita" is singular, so the verb should also be singular. Hence, "have invited" should be corrected to
"has invited."
Grammatical rule used: When two singular nouns are connected by "either...or" or "neither...nor," the verb agrees with the nearest subject. Grammatical rule in Hindi: यदि "either...or" या "neither...nor" का उपयोग किया गया हो, तो क्रिया (verb) हमेशा निकटतम विषय (subject) के अनुसार होती है।
Example:
· Either Ravi or Seema
is coming to the event.
· Neither the students nor the teacher
was late.
Corrected sentence: Either Sam or Ishita
has invited her for the Christmas party.