Respuesta :
I believe the right answer to be C.
Explanation:
First of all, the word 'search' is literally in the word research. 'Re' means to check again or redo. So, 'research' means to search again.
For more evidence:
It isn't A because... well, I hope you know it's not A.
It isn't D because researching something is NOT taking a break from your work. It's the opposite, really.
So, between B and C, I believe C to be the better answer.