Given Other Things Being Equal-Such as Looks,money,etc

Given other things being equal-such as looks,money,etc.-with which of the following types of individuals are we most likely to fall in love?

A) Your lab partner in your weekly chemistry lab class
B) The person who works two floors down from you at the same company in a different division
C) Someone you noticed coming into your classroom as you were leaving it
D) Someone you have just met down at the local bar-lust at first sight