(A) there is excess demand in the labour market (X)
(B) there are some people who will not work at the going wage rate. (X)
(C) people are not willing to work at the going wage rate. (X)
(D) at the going wage rate, there are people who want to work but cannot find work. ()
Answers: Unemployment means that at the going wage rate, there are people who want to work but cannot find work.