Final answer:
To increase bone mass, Monique should choose walking, as it is a weight-bearing exercise that stresses bones and stimulates bone building, unlike cycling and swimming.
Step-by-step explanation:
Monique would like to perform exercises that increase her bone mass. To help achieve this goal, the best activity for her to perform would be C. Walking.
Walking is a weight-bearing exercise that works against gravity and can help maintain or increase bone mineral density. It is beneficial for bone-building because it puts stress on bones, which stimulates bone building. Unlike walking, cycling and swimming are less effective for increasing bone mass because they are not weight-bearing exercises and do not stress the bones as much.
Therefore, to increase bone mass, Monique should focus on weight-bearing activities like walking, which can contribute to stronger bones and reduce the risk of osteoporosis.