肾病患者需要食用低钠盐的食品，目前市场供应的低钠盐多为苹果酸钠盐（C₄H₅O₅Na）。每日食用5g苹果酸钠盐，人体镊入的钠元素仅为等量食盐中钠元素的[ ]

A．18.7%

B．26.7

C．37.5%

D．43.1%

(A) 条件(1)充分，但条件(2)不充分．
(B) 条件(2)充分，但条件(1)不充分．
(C) 条件(1)和(2)单独都不充分，但条件(1)和条件(2)联合起来充分．
(D) 条件(1)充分，条件(2)也充分．
(E) 条件(1)和条件(2)单独都不充分，条件(1)和条件(2)联合起来也不充分．

All of the tickets for two real estate seminars, F and G, were either purchased or given away, and the ratio of F tickets to G tickets was 2 to 1. Of the total number of F tickets and G tickets, what percentage was purchased
(1) The total number of F tickets and G tickets is 240.
(2) Of the F tickets, exactly 60 percent were purchased, and of the G tickets, exactly 80 percent were purchased.