What is the best explanation for why the writer would revise this sentence to use passive voice

What is most likely nelson mandela's purpose of using third person point of view after introducing himself in his introductory paragraphs

This summer, stretched on well into fall, yielded a rich crop a. which b. itself c. whose d. those

Choose the sentence that is not logically connected in the paragraph. (1) it all happened late one night after the family had gone to bed. (2) jack was lying in bed when he remembered he had left the groceries on the back seat of the car. in the paper bag was a carton of ice cream. (3) the ice cream would melt during the warm summer night. (4) he put it in the refrigerator.