Explanation:

- The series follows a particular pattern. Let's break it down:

1. Start with 45.

2. Add 1 to get 46.

3. Subtract 4 to get 42.

4. Add 9 to get 51.

5. Subtract 16 to get 35.

6. The pattern follows: +1, -4, +9, -16, a sequence of alternating addition and subtraction applying the squares of consecutive numbers (1^2, 2^2, 3^2, 4^2...).

- Next, you should add 5^2 (25) to 35.

- So, 35 + 25 equals 60.

- Therefore, the correct option is: 1 - 60.