Correct option is A
In this question following logic is followed-
(3rd - 2nd) – (2nd – 1st) = 2
(17, 26, 37) → (37 – 26) – (26 – 17) = 11 – 9 = 2
(170, 197, 226) → (226 – 197) – (197 – 170) = 29 – 27 = 2
Similarly,
(48, 63, 80) → (80 – 63) – (63 – 48) = 17 – 15 = 2
Therefore, the correct answer is (a).