The correct option is C Will the film have started by the time we get there?
Tense is used to provide more information about an action ( its time, completeness, etc.). Option C)Will the film have started by the time we get there?. is correct as the given sentence uses the future perfect tense and to convert the sentence into its interrogative form, we must place 'will' before 'the film' and 'have started' after 'the film' The other options are wrong as they are not structured correctly (interrogative sentence in future perfect tense). The correct answer is C)Will the film have started by the time we get there?