39. Figure 5 shows a power divider of power ratio PL1/PL2 =1, where PL1 and PL2 are the power delivered to the loads Rei and Riz, respectively. The loads have resistance RiI = 750 and RL2 = 300 , and the characteristic impedance of the transmission line is Z0 = 50 Ω . Find the characteristic impedances Z1 and Z2 of the quarter-wavelength transmission linesso that the impedance is matched from the source. (A) Z1=61.2Ω,Z2 = 122.5Q； (B)Z1= 122.5Ω, Z2=61.2Ω； (C)Z1=86.62Ω,Z2=173.2Ω； (D) Z1= 173.2Ω,Z2 =86.6Ω； (E) It is impossible to match the loads by using the quarter-wavelength transformers.