- Option : C
- Explanation :

A finishes the job at standard rate in 12 days.

So in 1 day, the part of job done by A = 1/12

Similarly the part of job done by B in 1 day

So, in (2 alternate days work of 'A' and 'B')

3 x 4 = 12 days

They will finish 3 x (5/18) = 15/18 th of the work.

Work remaining = 1 - (15/18) = 3/18 = 1/6

This is finished by A alone in = 2 days.

Hence, total number days = 12 + 2 = 14 days

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