A riddle

[Thanks to old-time reader Signalroom.]

A man is dating three women and trying to decide which to marry. He gives each of them $5,000 to see what they do with the money.
The first has a total makeover. She goes to a fancy salon, gets her hair, face and nails done, and buys several new outfits. She tells him she has done this to be more attractive to him, because she loves him so much.
The second buys the man a number of gifts. She buys him a new set of golf clubs, some accessories for his computer, and some expensive clothes. She tells him that she has spent all the money on him because she loves him so much.
The third woman invests the money in the stock market. She earns several times the $5,000. She gives him back his $5,000 and reinvests the remainder in a joint account. She tells him she wants to invest in their future because she loves him so much.
Which one does he choose?
Answer: the one with the biggest boobs.