Answer:
I haven't read the book, but I believe it would make sense to say it's D, he found a candy bar
Step-by-step explanation:
If it's been three days, it'd be likely that he already got whatever he needed from the plane after the crash and that he'd already had figured out how to catch rabbits because what else would he eat to survive? That would leave you with either option C or D, and I find it logical to go with D, but just remember that your answer is your own choice and that mine could very well be incorrect.
If this was wrong or too late, I apologize.