Amy’s graduate seminar in history meets once each week, on Thursday afternoons. If it met every Thursday in the month of May, how many times did the seminar meet that month ？（）
(1)There were five Wednesdays in the month.
(2)The seventeenth of May was a Friday.
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．
