If the cost of $1$ glitter pen is $\$4$, then what is the cost of $90$ such pens?

The correct option is B $\$360$
Given in the question that the cost of $1$ pen is $\$4$ and we need to find the cost of $90$ glitter pens.

Cost of $1$ pen $=\$4$
Cost of $90$ pens $=90\times \$4$
$=\$360$

Cost of $90$ glitter pens would be $\$360$.