Place the following substances in order of increasing vapor pressure at a given temperature.

NF3 NH3 BCl3

Select one:
A. NH3 < NF3 < BCl3
B. BCl3 < NH3 < NF3
C. NH3 < BCl3 < NF3
D. BCl3 < NF3 < NH3
E. NF3 < NH3 < BCl3