Place the following substances in order of increasing vapor pressure at a given temperature.
NF₃; NH₃; BCl₃

(A) NH₃ < NF₃ < BCl₃
(B) BCl₃ < NH₃ < NF₃
(C) NF₃ < NH₃ < BCl₃
(D) NH₃ < BCl₃ < NF₃
(E) BCl₃ < NF₃ < NH₃