Study the given pattern carefully and select the number from among the given options that can replace the question mark (?).

Correct option is C

Logic - similar difference with two pair of numbers  as given follow
17 – 16 = 1
14 – 13 = 1
17 – 12 = 5
9 – 4 = 5
similarly in the next,
32 – 29 = 3
20 – 17 = 3

final answer is 20.