The overall tertiary sector has not increased in prominence for the reasons :

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Particular requirement of skills in the tertiary sector

No Job security

High incomes

All of the above

answer is D.

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Detailed Solution

The overall tertiary sector has not increased in prominence for all of the above reasons:
1)      Particular requirements of skills in the tertiary sector:
In this sector, only highly-educated and skilled professionals can get employment. Others engage themselves in low-paid jobs.
2)      High incomes:
Higher incomes are available only for top-level administrative jobs in this sector. Low-paid jobs do not attract employment.
3)      No job security:
In this sector, many workers are casual with irregular and low incomes, barely enough to sustain their livelihoods.

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