Correct option is D
Given: 31J, 29F, 31M, 30A, 31M, 30J, ?
Logic: The series alternates between the number of days in each month and the first letter of the month, and the next month, July, has 31 days and starts with "J," so the next term is 31J.
1J: January has 31 days, and its first letter is J.
29F: February has 29 days (this assumes it's a leap year), and its first letter is F.
31M: March has 31 days, and its first letter is M.
30A: April has 30 days, and its first letter is A.
31M: May has 31 days, and its first letter is M.
30J: June has 30 days, and its first letter is J.
The next month in the series is July, which has 31 days and starts with J.
Therefore, the next term in the sequence will be 31J.
Thus, the correct answer is (d) 31J.