A,B,C,D and E are five persons to complete jobs X and Y. Line graph shows the data regarding the number of days taken by these persons to complete the job X and Y.

If B worked on job Y with 4/9 times his work efficiency and assisted by D every `3^(rd)` day then find the number of days for which B and D worked to complete the job.

Options

A. 18
B. 13
C. 16
D. 12