Correct option is C
The correct substitution of the highlighted segment is
“have been given a pair”.
Explanation: The subject is
“students” (plural), so the helping verb should also be plural –
“have”, not “has.”
Correct structure:
Plural subject + have been + past participle
Example: The employees
have been given their bonuses.
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Grammar Rule:
✔ Subject-verb agreement – Plural nouns take plural verbs
✔ Present perfect passive voice structure: have/has been + V3