A work can be finished by 10 men in 8 days and by 10 women in 7 days. In how many days will the work be finished if 10 women and 10 men work on alternate days, with the women starting on the first day?

A

$$7\frac{3}{7}$$

B

$$7\frac{4}{7}$$

C

$$7\frac{3}{8}$$

D

7.5