Choice A reason:

This statement is correct. Rapid weight loss, especially when accompanied by a high-fat diet, can increase the risk of gallstone formation. Rapid weight loss can lead to an imbalance in bile composition, increasing the likelihood of gallstone development.

Choice B reason:

This statement is incorrect. Rapid weight loss can impact gallstone formation, and it is essential for the client to be aware of this potential risk.

Choice C reason:

Rapid weight loss does not reduce the risk of gallstone formation. In fact, it may increase the risk due to changes in bile composition and gallbladder motility.

Choice D reason:

This statement is incorrect. Rapid weight loss, especially with a low-fat diet, can contribute to gallstone formation due to changes in bile composition and gallbladder function.