If k is the sum of the digits of integer m, and m=10n, where n is an integer, which of the following must be true? Choose one:
A) k is not divisible by 9
B) The sum of the digits of k is divisible by 3
C) m is a multiple of 10k
D) k is a multiple of 9
E) k is a multiple of 6
m= 10n i.e n =1,2,3 ,4 etc or -1,-2.-3 ,-4 then m =10,20,30,40 or -10 ,-20 ,-30 ,-40 then k 1,2, 3,4 or -(1+0) , -(2+0) , -(3+0) ,-(4+0) .   ans(m is a multiple of 10k)
<result>C</result>
If k is the sum of the digits of integer m, and m=10n, where n is an integer, which of the following must be true?