Divide up or break up

[AndyJung]

Hi, teachers. I have a one small question.

During the experiment, the element started to ____________ up.
a. break b. divide c. explode d. create

I think the answer is b. But I'm not sure.
Could you tell me which one is correct answer?

Thanks in advance.

[bhaisahab]

Hi, teachers. I have a one small question.

During the experiment, the element started to ____________ up.
a. break b. divide c. explode d. create

I think the answer is b. But I'm not sure.
Could you tell me which one is correct answer?

Thanks in advance.

The only answer that works with "up" is a) "break".