Select the number that can replace the question mark (?) in the following series.

3, 5, 9, 15, 23, 33, 45, 59, ?

Given: 3, 5, 9, 15, 23, 33, 45, 59, ?

Logic: Difference is increasing by 2.

3 + 2 = 5,

5 + 4 = 9,

9 + 6 = 15,

15 + 8 = 23,

23 + 10 = 33,

33 + 12 = 45,

45 + 14 = 59

Similarly,

59 + 16 = 75

Thus, correct option is (a).