The answer is your first option, "A large and varied quantity"!
Your clue "covered" in the question should help to let you know that the amount will be more than normal, so you can eliminate the second option, and it's also describing the amount of something, so you can eliminate the last two options because they're not describing the amount, they're describing their other physical qualities.
Hope I helped and good luck with whatever you're working on! :)
