Asked by KRITARTH AGARWAL · DALMIA VIDYA MANDIR, RAJGANGPUR
Answer: C. at
'At' is used for exact times such as 7 pm, 8 o'clock, noon and midnight. 'On' is used for days and dates (Monday, 10th July). 'In' is used for years, months and seasons (in 2015, in June, in summer).
Answering after opening this box earns no Practice Points.