A1. Which of the following expressions is a multiple of 9?
(A) $2^{18}$
(B) $2018-9$
(C) $2+0+18$
(D) 2018
(E) $(2+0)(1+8)$
A1. A multiple of the number 9 is a number that is divisible by 9. Among the given answers, only the number $(2+0)(1+8)=18$ is.