Answer:
A. 12.6
Step-by-step explanation:
Required rate of return of Stock is calculated as below:
=

In this equation,
= Risk free rate of interest on long term bonds, here it is 6% on T-Bonds.
= Beta defined for the security, here, it is value of 1.2
= Expected rate of return on market = 11.5%
Now, putting each individual value in the formula we have,
= 6% + 1.2 (11.5% - 6%)
= 6% + 6.6%
= 12.6%