List All Subsets of the Following Set $$H = \{ 3 \}$$

Multiple Choice

List all subsets of the following set. $$H = \{ 3 \}$$

A) $\varnothing , \{ 3 \}$
B) $\{ 3 \}$
C) $\varnothing$
D) $\{ Q \} , \{ H \}$
E) $H$