Answer: Option 'b' is correct.
Explanation:
Since we have given that
Number of people who are working full time = 10 million
Number of people who are working part = 5 million
Number of people who are interested in working and looking for work = 5 million.
As we know that
Total labor force = Total employed people + Total unemployed people
So, it becomes

Hence, Option 'b' is correct.