They would fill the feed bins with sand and then top them off with grain and meal.
I'm pretty sure the answer you are looking for is C rhetorical question though I'm not sure. I've looked the question up on quizlet though it didn't come out well idk it wasn't very understandable, though I am pretty sure it is C. Hope this helps.
Answer:
an
Explanation:
The word idea starts with a vowel and the adjective needed shouldn't also end with a vowel. And in this case, you can't use a because it's a vowel. So, you use an.
Outside is the word acting like an adverb
