Professional Typing Service opens in Westside Mall, 1400 University Avenue across from State University Student Union. We specialize in term papers, reports and lectures typed to the specifications of the Graduate School of State University. Twenty-four service for fifty pages or less.
Forty-eight-hour service for more than fifty pages.
Rates: ＄1.00 per page on regular stock paper
           ＄1.25 per page on cotton bond paper
           ＄0.25 extra for each copy
Hours: 8:00 am — 10:00 pm. Monday — Friday
           8:00 am — 4:00 pm. Saturday
           Closed all day Sunday
2．When does Professional Typing Service close on Wednesday ?
A．10:00 pm.        B．8:00 pm.
C．4:00 pm.          D．It is closed all day.

请问：为什么选B？