Structural unemployment

a. is the main component of cyclical unemployment.

b. is said to occur when people are waiting to be called back to previous jobs.

c. may involve a locational mismatch between unemployed workers and job openings.

d. is also known as frictional unemployment.

C) may involve a locational mismatch between unemployed workers and job openings.

Explanation:

Structural unemployment results from workers lacking the skills and abilities that employers require to fill in vacant job openings.

Many times structural unemployment results from workers being on the wrong place, e. g. people searching for work in Silicon Valley should know about computers, but the same person will probably lack the skills for working in a farm in Kansas.