The answer is b, are.
The reason is because it is the only one that fits in the sentence that makes sense!
The anwser would be the last one,
shop til you drop
The correct answer should be
<span>(Do you see this grain of sand)
The subject is the little grain of sand because it's the focus of the poem and is also the doer of the action of bringing a thought.</span>
I'd say that the answer is Apt. I'm not entirely sure on this one, so you may want another opinion. Hope this helped you :)
As great as an opportunity as that it for those of us that answer it, what you're asking is plagiarism and can be a severe threat to your grade- let alone make you flunk or need to retake the class.