`BF_(3) and NH_(3)` undergo a lewis aciid-base reaction forming an adduct. Which picture below correctly represents the curved arrow notation for the initial lewis acid-lewis base interaction in this reaction, what is the lewis acid and the lewis base?
A. Picture (1) is correct, `NH_(3)` is the lewis acid and `BF_(3)` is the lewis base
B. Picture (2) is correct , `BF_(3)` is the lewis acid and `NH_(3)` is the lewis base
C. Picture (3) is correct, `NH_(3)` is the lewis acid and `BF_(3)` is the lewis base.
D. Picture (4) is correct, `BF_(3)` is the lewis acid and `NH_(3)` is the lewis base.
