A b or c please answer I’ll give brainliest

The answer is 61 200 000.
If we want to get 6.12 x [tex]10^{x}[/tex] we need to move the decimal to left. To obtain 6.12, we move the decimal to the left 7 times. So the answer will be 6.12 x 10 to the power of 7.
Therefore, the answer is C.