M: Miss Smith, I told Dr. Brown that I would call him in the Houston office at ten o'clock by their time. Please find out the time difference for me so that I'll know when to place the call. W: It's two hours earlier in Houston, sir. I know without looking it up because my sister lives there., Question: When should the man place his call to Houston? (A) At 8:00. (B) At 10:00. (C) At 12:00.
(A) At 8:00.