When Strongly Heated,boric Acid Breaks Down to Boric Oxide and Water.What

Multiple Choice

When strongly heated,boric acid breaks down to boric oxide and water.What mass of boric oxide is formed from the decomposition of 15.0 g B(OH) ₃?
2 B(OH) ₃(s) $\to$ B₂O₃(s) + 3 H₂O(g)

A) 7.50 g
B) 15.0 g
C) 8.44 g
D) 16.9 g
E) 33.8 g