Two samples of a compound containing only nitrogen and oxygen are decomposed into their constituent elements. The first sample produces 2.602 g of nitrogen and 6.400 g of oxygen. The second sample produces 3.903 g of nitrogen. If these two samples are consistent with the law of constant composition, how much oxygen is produced by the second sample?
A.) 6.505 g oxygen
B.) 9.600 g oxygen
C.) 1.587 g oxygen
D.) 6.400 g oxygen