Correct option is D
Given: 203, 235, 268, 302, 337, ?
Logic: Difference of two constitutive number is increasing from 32, 33, 34, 35….
235 – 203 = 32
268 – 235 = 33
302 – 268 = 34
337 – 302 = 35
Similarly:
? – 337 = 36
? = 337 + 36
? = 337
Thus, correct option is (d).