A can do a piece of work in 4 days. B can do it in 6 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it? Choose the correct choice from the following answers:
A) 22 days  B) 12 days  C) 67 days  D) 17 days  E) 18 days
C = 1/2 - 1/6 - 1/4 = 1/12   =&gt; 12 days   Answer:12 days
<result>B</result>
A can do a piece of work in 4 days. B can do it in 6 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?