Final answer:
The situation described is discrete because the number of candles sold can only be counted in whole numbers.
Step-by-step explanation:
The situation described in the question is a. Discrete. In this scenario, Zach is selling candles and for each candle sold, the school receives $3.50. Since the number of candles sold can only be whole numbers (1, 2, 3, and so on), the situation is considered discrete. Discrete data refers to values that can only be counted and are separated by individual units or categories.