Answer: a) drive-reduction
Explanation: Homeostasis is basically the body's need to maintain stability necessary for survival despite changes in the world outside. It is the body's unconscious tendency to maintain internal states (temperature, sleep, thirst, hunger) at stable levels.
Drive-reduction theory, which is a major theory of motivation, suggests that when there is an Homeostatic imbalance, needs are created, people perform actions (i.e their behaviour changes) to restore the body's ideal state, because of the need to restore balance.
This isn't a full essay but there is some helpful information about Backstrokes. (Tip: Make sure to paraphrase the info you use)
The Backstroke, also known as a back crawl is one out of four swimming styles you can use. Out of the four swimming styles, the backstroke is the easier as far as breathing but maybe be harder to swim hence the fact you can't see. Backstrokes are great for strengthening your upper body and helps tighten your core according to PopSugar. In order to master this style of swimming, you have to have balance. The backstroke engages all of your core.
BAL is blood alcohol level. BAC will normally be higher in a person with more body fat. So the answer to your question would be, as body fat decreases, the increasing rate of BAL DECREASES.