10 points! Please Help!

It's not A. It is in scientific notification.

The distance of planet Jupiter from the Sun is approximately 7.8 ⋅ 108 kilometers, and the distance of planet Saturn from the Sun is 1.5 ⋅ 109 kilometers. About how many more kilometers is the distance of Saturn from the Sun than the distance of Jupiter from the Sun?

A 6.3 ⋅ 10^1 kilometers
B 6.3 ⋅ 10^8 kilometers
C 7.2 ⋅ 10^8 kilometers
D 7.2 ⋅ 10^9 kilometers