Answer:
c 10
Explanation:
If we want to know how much bigger object A is than object B is we take object A and divide it by object B
object A 4 * 10^-3
----------- = -------------
Object B 4 * 10 ^-4
When dividing exponents with the same base
We can subtract them. The numbers out front get divided
4/4 * 10 ^ (-3- -4)
1 * 10 ^(-3+4)
1 * 10 ^1
10