I Pass by a Woman as I Am Walking Down

I pass by a woman as I am walking down the sidewalk. She absolutely captures my attention. She mesmerizes me. If I am attracted to her based on smell, my state of attraction toward her is likely to be based on the:

A) pheromones she emits
B) incredible rate of neural activity associated with my vomeronasal organ
C) quantity of androsterone she is producing/emitting
D) the fact that her odors are notably distinct from my own