The difference between job enrichment and job enlargement is that:
选项：

A: enlarged jobs involve vertical expansion, while enriched jobs involve horizontal expansion.
B: enriched jobs enable an employee to do a number of boring jobs instead of just one.
C: job enlargement is more psychologically satisfying than job enrichment.
D: job enrichment is suitable for all employees, whereas job enlargement is not.
E: enriched jobs involve vertical expansion, while enlarged jobs involve horizontal expansion.