Correct option is B
Given:
170, 197, 226, ..
Logic: +27, 29, .....
197 - 170 = 27
226 - 197 = 29
The differences are increasing by 2 each time.
So, following this pattern, the next difference should be:
29 + 2 = 31
Adding 31 to the last term in the series (226)
226 + 31
= 257 next in the following series