The principle that Latasha caters for that her husband does not is that d. Many decisions are taken using marginal thinking.
By swimming more, Latasha would make get the benefit of being better at something she is already good at. If all she does is swimming however, she would incur costs of losing out in the other activities which would surpass the benefits of being good in swimming alone.
In conclusion, option D is correct.
Find out more about marginal decision making at https://brainly.com/question/13764545.