Table 2 the Figures in the Table Below Are Taken from from the Statistics

Table 2. The figures in the table below are taken from the statistics office in a fictional country called Exland. $\begin{array}{|l|r|}\hline \text { Number of workers employed } & 8,400 \\\hline \text { Frictional unemployment } & 250 \\\hline \text { Structural unemployment } & 350 \\\hline \text { Cyclical unemployment } & 600 \\\hline \text { Discouraged workers } & 400 \\\hline \text { Adult population } & 12,000 \\\hline\end{array}$
Refer to table 2. How large is the labour force in Exland?

A) 7,550.
B) 8,000.
C) 8,400.
D) 9,600