[ Grammar ]
Kat and Kim helped their grandfather clean the floor. Which antecedent is the pronoun “their” referring to in the given sentence?
A. grandfather
B. Kat and Kim
C. their
D. the floor

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Charis decided to remind Mark about the details of the birthday party again lest he ______. (Think carefully!)
A. forget
B. forgot
C. forgets
D. had forgotten