The extractive sector employs relatively few workers because of

The extractive sector employs relatively few workers because of
 
  a. the sector's high productivity.
  b. the relative unattractiveness of farm work.
  c. tight immigration laws.
  d. stiff international competition.
  e. federal price supports.

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How is the declining middle related to the reduced proportion of jobs in manufacturing?
 
  a. The loss of jobs led to the decline of the Midwest.
  b. The middle sector in the sectoral transformation was reduced in size.
  c. In the jobs that were lost, wages had clustered around the middle range of income.
  d. The remaining manufacturing jobs are no longer held by the middle class.
  e. There are fewer jobs available in the downtown portions of cities.