A and B together can complete a task in 15 days. If A works half as efficiently as he usually does and B works thrice as efficiently as he usually does, then the task gets completed in 8 days. How many days would A take to do the task if he works alone?

A

$$33\frac{1}{3}$$

B

$$66\frac{2}{3}$$

C

$$26\frac{2}{3}$$

D

30