Answer: a.
Step-by-step explanation:
So let’s say a=1 and b=1 so then 1*1=2 (So 2=c) so in conclusion c/b (or 2/1) equals a (1) which would be the a (1). You can plug in any number into the equation (a*b=c) and (c/b=a) and it will always get the same answer. As long as you use the same numbers for a, b, and c. I really hope this helps.