Is 9 + 3 + 6x the simplify expression of 9 - (3 - 6x)?

Explain why?

Ahe should multiply before subtracting

Bhe should subtract 9 - 1 first

Che cannot simplify 3 - 6x

Dhe correctly simplified inside the parentheses first

Ehe did not multiply 3 by -1 correctly

f) he distributed correctly