Not exactly sure but your teeth and saliva break down food before it becomes further broken down in the stomach(churning action and the stomach acid) it then passes to the small intestines as chyme. So with process of elimination it is definitely not C or D. So it is up to you to decide what counts as digesting. It is either A or B even though in real life both make sense
Im not quite sure but i would go with 1. changing to a completely new type of activity - overcoming a plateau 2. making your goals easier - restarting after a break
