please explain clearly how you got the answer , thankyou!

13. The managers of company True expect to obtain a return on equity (ROE) of 24 %, which is larger than the 18% required return on equity of investments with similar risk. The managers of this company reinvest 70% of the net earnings back into the company. If the ROE and the payout of this company are expected to remain constant in the future, what is the ratio of the market to book value of this company? a) 5 b) 2 c) 6 d) None of the above are