A drawer contains $10$ yellow socks, $8$ blue socks and $4$ pink socks. Bella picks socks from the drawer without looking. What is the smallest number of socks she must pick to make sure she has at least one sock of each colour? 
选项为:A:$$3$$  B:$$4$$  C:$$18$$  D:$$19$$  请回答其中一个选项.