Answer: The answer is B. The removal of the small box hints at a secret or hidden act that one character my commit later, thus creating anxiety about what will happen.
Step-by-step explanation:
A Makes absolutely no sense in any way.
C Doesn't make any sense either, because why would the small box be metal, just because they were in a living room?
D doesn't quite add up either because since we don't know what is in the box, or why the character took the box we don't know that it's for some evil reason. The character who took the box might know that there is something in the box that will hurt the other character, but because they did it in secret, it might indicate the character can't be trusted. So it might be D, but it's less likely than B, I think.
Suspense is created by telling the audience something that the main character, or a secondary character doesn't know, so now you, the audience, has information that a certain character does not -- you know that the other character took the box off the self, but the looking away character does not know that. Now suspense is forming as you wonder why the character took the box, what's in the box, and why they took it in secret.
I hope this helps! Have a great weekend!