I'd go with D for excess sodium / fluid intake. And I'm only partially joking.
The problem is the answer choices all avoid asking directly relevant questions merely to throw students off.
If I ask if someone's been out of the country lately here in Texas, they could have been just as likely to hopped on a cruise or to have driven over the border into Mexico. It would be wrong to assume "international flight = DVT" in this case, especially when the symptoms are not those of pulmonary emboli, per say.
Hx CHF plus the current symptoms scream exacerbation of CHF, so then narrow down to what would possibly exacerbate it. Being married, babysitting, and traveling don't particularly or directly exacerbate CHF. Although I suppose one could make a case for forgetting to timely take medications while traveling.
Another quality question designed to trick students instead of teach them. In reality, people ask "Have you flown more than two hours recently?", "have you taken all of your prescribed medications on schedule?", and "Has your diet changed or been modified in some way recently?"