What has contributed to a shift in the type of skills needed for employees in the U.S. economy is: a. use of computers to do routine tasks.
In the united state of America economy the use of computer system to carried out tasks has contributed to a shift in the skills needed for employee.
Based on the fact people prefer to make use of computer to carried out their assign tasks or day to day tasks thereby saving time.
Therefore the correct option is A.
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