An Investor Currently Holds the Following Portfolio

An investor currently holds the following portfolio:
Amount
Invested
8,000 shares of Stock A $16,000 Beta = 1.3
15,000 shares of Stock B $48,000 Beta = 1.8
25,000 shares of Stock C $96,000 Beta = 2.2
The investor is worried that the beta of his portfolio is too high,so he wants to sell some stock C and add stock D,which has a beta of 1.0,to his portfolio.If the investor wants his portfolio to have a beta of 1.72,how much stock C must he replace with stock D?

A) $18,000
B) $24,000
C) $31,000
D) $36,000