The correct option is B 21st May
According to Kailash, Deepak`s birthday falls on onev of the day among 21st, 22nd, 23rd, 24th, 25th, 26th, and 27th May. According to Geeta, Deepak`s birthday falls on one of the days among 13th, 14th, 15th, 16th, 17th, 18th, 19th, 20th, and 21st May. The day common to both the groups is 21st May.
∴ Deepak`s birthday falls in 21st May.