if i had had free time

if i had had free time

jawaban yang tepat adalah C. I would have watched the movie together with my friends.
Pembahasan
Soal tersebut merupakan Conditional Sentence / If Clause Type 3 yang ditandai dengan penggunaan had + V3 di dalam soal. Rumus Conditional Sentence / If Clause Type 3 adalah If + Past Perfect (had + V3) + Past Future Perfect (would have/could have/might have + V3).

Dengan demikian jawaban yang tepat adalah C. I would have watched the movie together with my friends.