Which of the following sentences about the selection uses the past perfect tense?

A. I have planned to see the movie tomorrow
B. I still plan on going to see the movie tomorrow
C. I had planned to see the movie tomorrow, until I read the review
D. I still planned on going to see the movie tomorrow, unless it got bad reviews
Is the answer C?

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Yes, the answer is C. The sentence "I had planned to see the movie tomorrow, until I read the review" uses the past perfect tense. The past perfect tense is formed by using the auxiliary verb "had" followed by the past participle form of the main verb. In this case, the verb "plan" becomes "had planned" to indicate that the action of planning to see the movie took place before the action of reading the review.