Answer: Choice C

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Step-by-step explanation:
Divide 7.5 over 2.5 to get 3
Dividing the other terms means we subtract the exponents using this rule

So,

Overall,
which points to choice C
If you wanted to expand this out, then 3.0 becomes 300,000,000 = 300 million after moving the decimal point 8 spots to the right.