Correct option is C
Given:
25, 23, 29, 28, 33, 33, ?
Given series contains two series.
Series 1: 25, 29, 33, ?
Logic: 4 is added in each number.
25+4=29
29+4=33
33+4=37
Series 2: 23, 28, 33
Logic: 5 is added in each number.
23+5=28
28+5=33
So, missing number = 37
Thus, correct option is (c).