Answer:
A. Structurally Unemployed
Explanation:
Structural unemployment is unemployment resulting from changes in the pattern of demand for goods and services or changes in technology like in this case. These changes may in turn alter the structure of the total demand for labour rendering some particular skill less in demand or may become obsolete. The demand for other skill however may expand. Unemployment in this case is the result of the composition of the labour force which does not respond quickly to new structures of job opportunities. In this case, there's a decline for workers demand in aircraft industry, as a result, the laid of workers skills are not matched with the probable current jobs available.