Samantha and Zach are the parents of five children, ages $8,11,16,17,$ and $21.$ The $21-$year$-$old is a full$-$time college student who has a part$-$time job income of $$7,650.$ Samantha and Zach provided more than $50\%$ of the support for every child. Assuming they file a joint return, how many of the dependents on the return would qualify $($due to age$)$ for the Child Tax Credit in TY$2021?$

Select one:

a$.$ One $(1)$

b$.$ Two $(2)$

c$.$ Three $(3)$

d$.$ Four $(4)$