b) to mountain-bike
since the sentence follows along with to run and to swim the answer has to be "to mountain-bike".
Past tense i think. this has to be 20 characters long sooo
B. engineer would most likely use it
A memoir is a biography which is a historical written account based on personal knowledge or special sources. Since it is considered a biography, the point of view that is used in a memoir is first-person point of view. In the first person point of view, the pronouns that can be used are I, me, my, mine, we, us, ours, and our.