<em>Sentence 4) I did not know my small act of service would go down in history</em><em> is from an autobiography.</em>
Explanation:
An <u>autobiography</u> is a self-written piece of writing that accounts of the life of oneself. In other words, it is the <em>biography of oneself narrated by onesel</em>f. Therefore, sentences 1,2 and 3 cannot be from an autobiography because they are narrated in 3rd person. Sentence 4, on the other hand, meets the requiremets to be considered as part of an <u>autobiography</u>.
Answer #4 is from an autobiography, an autobiography is a piece written by someone, about themselves, so in this case, answer 4 is the only one with a pronoun relating to oneself.
The form of the verb plan in the sentence is active. Thus, the answer to this item is letter A. An active verb is when the subject is the clearly the "doer" of the action. From the sentence, the subject is I and is clearly the doer of the action which is planning.