Concept:The sample size is the total number of possible outcomes when a die is tossed twice.Explanation:When a fair die is tossed once, there are 6 possible outcomes.When the die is tossed twice, each toss is independent.So, the total number of outcomes is the product of the outcomes for each toss.Total sample size =6×6=36.Answer:The sample size is 36.Correct option: C. 36.