Explanation:

- Let's look at the series: 25, 34, 52, ?, 160, 304.

- Calculate the differences:

- 34 - 25 = 9

- 52 - 34 = 18

- The differences are 9, 18, then we identify a pattern.

- Notice the differences are increasing by a factor of 9:

- So, next should be 18 + 9 = 27

- Add this to the previous number:

- 52 + 27 = 79

- Next numbers follow the same pattern: 79, 79 + 81 (27+27+27) = 160, 160 + 144 = 304.

- ? Answer: Option 2 - 80