radioactive decay occurs when atoms

a) lose mass
b) join with atoms of another element
c) break down to form atoms of another element
d) are exposes to chemical weather

does anyone have all the answers?

I think the answer is c) break down to form atoms of another element

c is the best answer.

duhh she needs help there is nothing wrong with that

the answer is C

is this for usa test prep?

I don't know help!!!!!!

ya, she knows

well.........

Is C the answer?