In the Electrolysis of Water, How Many Grams of Oxygen $\rightarrow$

In the electrolysis of water, how many grams of oxygen gas will be produced for every gram of hydrogen gas formed? Reaction: 2H₂O(l) $\rightarrow$ 2H₂(g) + O₂(g)

A) 31.7 g
B) 15.9 g
C) 7.94 g
D) 3.97 g
E) 1.98 g