Rob and Tim Are of the Same Weight, Height, and Relative

Rob and Tim are of the same weight, height, and relative size. Rob exercises every day, whereas Tim only exercises once a month. Which of the following is true about each man's basal metabolic rate (BMR) ?

A) When both men are at rest, Rob burns more calories than Tim.
B) When both men are at rest, Tim burns more calories than Rob.
C) Rob will gain and lose weight faster than Tim.
D) It is impossible to determine each man's BMR without knowing how much they eat on a given day.