Which One of the Following Is True About Job Enlargement

Which one of the following is true about job enlargement and job enrichment?

A) Job enlargement efforts that focus solely on increasing the number of tasks are largely effective in increasing employee motivation.
B) Research shows that job enrichment improves employee motivation and satisfaction.
C) Expanding the scope of knowledge used in a job leads to more job satisfaction, enhanced customer service, and fewer errors.
D) Research shows that job enrichment is very useful in improving the quality of work of employees.