Answer:
Security D
Explanation:
Fair rate of Return  = [tex]R_{f} \ +\ B( R_{m}\ -\ R_{f} )[/tex]
where B Â = Beta, which is the degree of responsiveness of security return to market return
[tex]R_{f}[/tex] = Risk Free Rate of return
[tex]R_{m}[/tex] = Return on market portfolio
[tex]R_{m}\ - \ R_{f} =[/tex] Risk premium which is, 10 - 4 = 6 %
Thus, for security A = 4 + 0.85 × 6 = 9.1%
     for security B = 4 + 0.75 × 6=  8.5%
     for security C = 4 + 1.2 × 6 = 11.2%
     for security D = 4 + 1.35 × 6 = 12.1%
     for security E = 4 + 0.5 × 6 = 7%
Expected returns as given Â
   for A = 7%
   for B = 9%
   for C = 9.5%
  for D = 12.1%
   for E = 14%
As is evident, the fair and expected return for stock D is the same i.e 12.1%. Hence, the investor would be indifferent in that case whether to buy, sell or hold such a stock.