What is the expression for the volume of hydrogen gas, in dm³, produced at STP when 0.30 g of magnesium reacts with excess hydrochloric acid solution?

Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

Molar volume of an ideal gas at STP = 22.7 dm³$\,$mol⁻¹

A.     $\frac{{0.30 \times 2 \times 22.7}}{{24.31}}$

B.     $\frac{{0.30 \times 22.7}}{{24.31}}$

C.     $\frac{{0.30 \times 24.31}}{{22.7}}$

D.     $\frac{{0.30 \times 22.7}}{{24.31 \times 2}}$

B