Four subjects — Physics, Chemistry, Mathematics and Biology were taught in four consecutive periods of one hour each starting from 8.00 a.m. At what time was the Chemistry period scheduled ?  _x005F_x000D_ I. Mathematics period ended at 10.00 a.m. which was preceded by Biology. _x005F_x000D_ II. Physics was scheduled in the last period. _x005F_x000D_ III. Mathematics period was immediately followed by Chemistry.

• A. Only I
• B. Only I or Only II
• C. Only II
• D. I and II together or I and III together