Personally, I would address the problem, explaining to your audience that you've lost your "train of thought" from there, make fun of the situation, say "let's see, where was I?" * recieve an answer from audience * then continue one.
To sum it, make fun, and a light hearted joke about it, and continue to your best ability.
Nick learns from Jordan Baker the details of Tom's behavior in Santa Barbara after his and Daisy's honeymoon. She tells Nick that Tom was involved in a car accident that made the newspapers. He was with another woman, a maid at the Santa Barbara Hotel. Her arm was broken. This shows Tom's infidelity began early in his marriage and continued. Daisy was aware of it (everyone who read the newspaper was aware of it), but she remained in her marriage and gave birth to their daughter several months later.
My guess would be C; because your family road trips are annual (once a year) meaning there would multiple to discuss, while all other options are single-time events.
Hope this helps!
