The following table provides a security analyst's expected return on two stocks in two particular scenarios for the market return.

State	Probability	Market return %	Stock A return %	Stock B return %
Poor	0.25	4	5.5	3.8
Good	0.75	15	33	12.6

What is the value of the risk free rate in the above economy?

a.

3%

b.

2.5%

c.

3.5%

d.

2%