The Bureau of Labor Statistics (BLS) report says that 140,196,000 were employed, 14,729,000 were unemployed, and 80,729,000 were not in the labor force.
And then the question asks for the total adult population .
To find the total adult population we have to just add all the numbers given
that is
employed + unemployed + those who are not in the labor force
So 140,196,000+14,729,000+80,729,000
= 235,654,000
So Option D is the correct answer.