Explanation:

- Let's look at the difference between each number in the series:

- 53 - 49 = 4

- 61 - 53 = 8

- 73 - 61 = 12

- 89 - 73 = 16

- The differences (4, 8, 12, 16) increase by 4 each time.

- Following this pattern, the next difference should be 20.

- Adding this to the last number in the series: 89 + 20 = 109.

- Option 2: 109 is the correct answer.

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