Which number is appropriate in place of a question mark?

সমাধান
সঠিক উত্তর: Option B
7 + 5 = 12
12 + 6 = 18
18 + 7 = 25
25 + 8 = 33
33 + 9 = 42
12 + 6 = 18
18 + 7 = 25
25 + 8 = 33
33 + 9 = 42