BF₃ and NH₃ Undergo a Lewis Acid-Base Reaction Forming an Adduct.Which

Multiple Choice

BF₃ and NH₃ undergo a Lewis acid-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;NH₃ is the Lewis acid and BF₃ is the Lewis base.
B) Picture (2) is correct;BF₃ is the Lewis acid and NH₃ is the Lewis base.
C) Picture (3) is correct;NH₃ is the Lewis acid and BF₃ is the Lewis base.
D) Picture (4) is correct;BF₃ is the Lewis acid and NH₃ is the Lewis base.