Final answer:
The term for assigning workers more tasks at the same level of responsibility is 'job enlargement'. It increases the number of tasks without increasing the complexity or responsibility level. option c.
Step-by-step explanation:
Assigning workers additional tasks at the same level of responsibility to increase the number of tasks that they have to perform is known as job enlargement. Job enlargement is different from job enrichment, which involves increasing the range and complexity of tasks to provide greater challenge to the worker, and from job rotation, which involves moving workers through a variety of jobs to increase their interest and motivation. Job enlargement simply adds more tasks of similar complexity to an employee's role.