3 men or 6 women can do a piece of work in 20 days. In how days will 12 men and 8 women do the same work ?

• A. ${\text{3}}\frac{1}{2}{\text{ days}}$$
• B. ${\text{3}}\frac{3}{4}{\text{ days}}$$
• C. [{\text{4 days}}\]
• D. [{\text{5 days}}\]