Resting metabolic rate (RMR) can be affected by:
a. age
Age is known to influence RMR, as metabolic rates typically decrease with age due to factors such as loss of muscle mass and hormonal changes.
The other options (b. daily value, c. appetite, d. hunger) do not directly affect RMR in the same way. Daily value refers more to nutritional guidelines rather than metabolic rate, while appetite and hunger are more related to feeding behavior.