Answer: C) The booster club provided a tray of fresh watermelon slices.
Step-by-step explanation: A sentence is in active voice when the subject is performing the action of the verb (example: Peter eats the cake). A sentence is in passive voice when the subject is being acted on by the verb (example: the cake is eaten by Peter). To transform the given sentence in active voice, we need to make "the booster club" the subject of the phrase and "a tray of fresh watermelon slices" the direct object, so the sentence would be "The booster club provided a tray of fresh watermelon slices."