In the Treatment Group, at the Outset of the Program

In the treatment group, at the outset of the program, the proportion of welfare recipients working full-time was 6 percent, after one year, 30 percent of the program group was working full time.
In the control group, at the outset of the program, the proportion of welfare recipients working full-time was 6 percent, after one year, 15 percent of the program group was working full time.
-Based on Reference 03-02, we can estimate that the impact of the program on labour market participation is:

A) 6 percent.
B) 24 percent.
C) 30 percent.
D) 9 percent.
E) 15 percent.