A can do a piece of work in 4 days. B can do it in 9 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?  Select the correct option:
A) 22 days
B) 36/5 days
C) 67 days
D) 17/7 days
E) 18 days
C = 1/2 - 1/4 - 1/9 = 5/36   =&gt; 36/5 days   Answer:36/5 days
<result>B</result>
A can do a piece of work in 4 days. B can do it in 9 days. With the assistance of C they completed the work in 2 days. Find in how many days can C alone do it?