Which equation represents this number sentence?

Nine more than the quotient of a number and 3 is 21.


n3+9=21
fraction n over 3 end fraction plus 9 equals 21

3n+9=21
fraction 3 over n end fraction plus 9 equals 21

n+93=21
fraction numerator n plus 9 end numerator over 3 end fraction equals 21

9n+3=21