Explanation:

- Let's determine how much work A and B do individually in an hour.

- A completes the task in 8 days working 5 hours daily, so A works 40 hours in total.

- In one hour, A does \( \frac{1}{40} \) of the task.

- B finishes the task in 10 days working 6 hours daily, so B works 60 hours in total.

- In one hour, B does \( \frac{1}{60} \) of the task.

- Together, when working 8 hours a day, they do \((\frac{1}{40} + \frac{1}{60}) \times 8\) of the task per day.

- Simplifying gives \(\frac{1}{15} \times 8 = \frac{8}{15}\).

- They complete the task in \(\frac{15}{8} = 1.875\) days.

- None of the options perfectly matches, but the closest option is Option 2: 2.3 days.