How do you convert the number of molecules of a substance to the number of moles?

a. add avogardo's number
b. subtract avogardo's number
c. multiply avogardo's number
d. devide avogardo's number

In order to convert this it has to be multiplied by the amount of the substance so in this case the answer would be C answer A makes no since because u are not finding the sum and B has nothing to do with it for the fact ur not detracting the mole