Explanation:

- B's Work Rate: B can complete the work in 8 days. This means B's work rate is 1/8 of the work per day.

- C's Work Rate: C can complete the work in 24 days. Therefore, C's work rate is 1/24 of the work per day.

- Combined Rate of B and C: Together, B and C can complete 1/8 + 1/24 = 1/6 of the work per day.

- A's Work Rate: A can do the work twice as fast as B and C together. So, A's work rate is 2 * 1/6 = 1/3 of the work per day.

- Time Taken by A: Since A completes 1/3 of the work in one day, A can complete the entire work in 3 days.

Correct Answer: Option 4 - 3 days