In a Country with a Working-Age Population of 20 Million

In a country with a working-age population of 20 million, 13 million are employed, 1.5 million are unemployed, and 1 million of the employed are working part-time, half of whom wish to work full-time. The size of the labour force is

A) 20 million.
B) 15.5 million.
C) 14.5 million.
D) 13 million.
E) 11.5 million.