Final answer:
To determine who had the greater magnitude of weight change, compare the amount of weight lost by Sam and the amount of muscle gained by Harry. Sam lost 5 pounds, which means his weight change was -5 pounds. Harry gained 3 pounds of muscle, so his weight change was +3 pounds. Since -5 is greater than +3, Sam had the greater magnitude of weight change.
Step-by-step explanation:
To determine who had the greater magnitude of weight change, we need to compare the amount of weight lost by Sam and the amount of muscle gained by Harry. Sam lost 5 pounds, which means his weight change was -5 pounds. Harry gained 3 pounds of muscle, so his weight change was +3 pounds. To compare these changes, we can consider that gaining weight is equivalent to a positive number and losing weight is equivalent to a negative number.
Since -5 is greater than +3, Sam had the greater magnitude of weight change. The answer is a) Sam.