Explanation:

- The series: 27, 29, 32, 37, 44, 55, 68, ...

- Identify the pattern by calculating the differences:

- 29 - 27 = 2

- 32 - 29 = 3

- 37 - 32 = 5

- 44 - 37 = 7

- 55 - 44 = 11

- 68 - 55 = 13

- These differences (2, 3, 5, 7, 11, 13) are consecutive prime numbers.

- Next prime number after 13 is 17.

- Adding 17 to 68 gives 85.

- Therefore, the number that replaces the question mark is 85.

Option 1: 85