For the following net ionic equation: Cu2+ + 4NH3 --> Cu(NH3)42+, if you mix 4.50 mL of 0.075M CuSO4 with 8.50 mL of 0.2 M NH3, what is the concentration of Cu(NH3)4 2+ ?
A. 9.8 x 10-4 M
B. 4 x 10-4 M
C. 2.6 x 10-2 M
D. 4.9 x 10-2 M