Hello~! Your answer iiiiisss...
B) 2 hydrogen, 1 sulfur, 4 oxygen.
Here's why:
The subscripts (the little numbers next to the element symbol) tells you how many atoms there are for the symbol on the left.
H₂ S O₄
So, there are two hydrogen atoms, one sulfur atom (beacuse there's no number next to it), and four oxygen atoms.
I hoped this helped you!