Just by looking at this question, and the answer choices, you can determine that the least formal answer is A. Kicking back. This is because when you think of formal, you think of respectful and professional. Answers "C," and "B," are things that one may say in a formal/professional way to someone. However, people don't normally use the term, "kicking back," as a formal use of speech.
Zadie Smith had always wanted to dig deeper in her father's war experience, but she never had enough courage to ask him, and neither did he.
One day, Zadie finds herself visiting an American poet friend in Normandy. And when they were visiting the beach there, she realized that it might be the place where, 59 years before, her father landed upon. So, she mentions this to her friend, who was also interested in war history of the area, and as a consequence, Zadie is interrogated by this friend. But in the end, Zadie relaizes she knows nothing about his father's war experence.
After this event, she returns home and feels determined to start interviewing his father.
