Answer:
A
Explanation:
I am not 100% certain but it seems the best.
Rolling a die and flipping a coin re out of the top, obvious reasons. Using a spinner 75% 25% seems less logical as it doesnt tell us the exact numbers of novels vs. biographies. However, choosing out of 3 white marbles (exact number of novels) or 2 black marbles (exact number of biographies) fits better.