小艾和小贝现在的年龄加起来是$$13+4\times 2=21$$（岁），  小贝现在的年龄比小克小$$17+19-21=15$$（岁），  所以小克和小艾现在的年龄加起来是$$21+15=36$$（岁），  小艾现在$$36\div \left( 5+1 \right)=6$$（岁），小贝现在$$21-6=15$$（岁）． 
$$4$$ years ago, the sum of the ages of Amy and Bella is $$13$$ years old. The age of Bella after $$17$$ years is $$21$$ years older than the age of Chris $$19$$ years before. The age of Chris now is $$5$$ times the age of Amy. How old is Bella now?  $$4$$年前，小艾和小贝的年龄加起来是$$13$$岁．小贝$$17$$年后的年龄比小克$$19$$年前的年龄大$$21$$岁．小克现在的年龄是小艾的$$5$$倍．小贝现在~\uline{~~~~~~~~~~}~岁. 
Options:
a: $$13$$ 
b: $$16$$ 
c: $$18$$ 
d: $$15$$ 
e: $$14$$ 