A $6$-digit number starting with $18$, $18ABCD$, is a multiple of $6$, $7$, $9$ and $10$. Find $\left (A +B + C+ D\right )$ for the smallest such number? 
选项为:A:$$7$$  B:$$12$$  C:$$14$$  D:$$28$$  E:None of the above  请回答其中一个选项.