The correct options are
B 2064
D 2068
The period of revolution of the Earth around the Sun is 365 days and 6 hours. For simplicity, a year is said to consist of 365 days only and 6 hours are taken out repetitively for 3 years and added to the fourth year, thus making the fourth year of 366 days (6 hours x 4 = 24 hours = 1 day).
A leap year is divisible by 4. Of the given options, 2064 and 2068 are divisible by 4 and hence these are leap years.