[单选题] 已知(P/A，8%, 5) = 3.9927, (P/A, 8%, 6) = 4.6229, (P/A, 8%, 7) = 5.2064,则6年期、折现率为8%的预付年金现值系数是( )。
A2.9927
B4.2064
C4.9927
D6.2064