(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

问题：

• (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．

A survey of 600 computer owners revealed that they owned a modem and/ or a scanner. How many of the people surveyed owned only a modem
(1) The number of people surveyed who owned only a modem was three times the number of people who owned only a scanner.
(2) Four hundred people who were surveyed owned both a modem and a scanner, which was eight times the number of people surveyed who owned only a scanner.