Ammonia Reacts with Diatomic Oxygen to Form Nitric Oxide and Water

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O
What is the theoretical yield of water, in moles, when 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

A) 1.30 mol
B) 1.57 mol
C) 1.87 mol
D) 3.53 mol
E) None of these.