A watch which gains uniformly, is 6 min. slow at 8 o'clock in the morning Sunday and it is 6 min. 48 sec. fast at 8 p.m. on following Sunday. When was it correct?

Question

( A ) 20 min past 7pm on friday
( B ) 20 min past 7pm on tuesday
( C ) 20 min past 7pm on thursday
( D ) 20 min past 7pm on wednesday