R-I : ${\mathrm{NH}}_3+{\mathrm{BF}}_3 \to {\mathrm{H}}_3\mathrm{N}\to {\mathrm{BF}}_3$

R-II : ${\mathrm{NH}}_3+{\mathrm{H}}^{+} \to {\mathrm{NH}}_4^{+}$

Correct statements about R-I and R-II are

A) NH₃ is a Lewis base in both R-I and R-II

B) NH₃ is a Bronsted-Lowry base in both R-I and R-II

C) NH₃ is a Lewis base only in R-I

D) NH₃ is a Lewis base only in R-II

E) NH₃ is a Bronsted-Lowry base only in R-II

F) NH₃ is a Bronsted-Lowry base only in R-I