Answer: Tell Thomas to focus more on task performance behaviors.
Step-by-step explanation:
The options are:
a. Tell Thomas to focus more on group maintenance behaviors.
b. Tell Thomas to focus more on participative leadership.
c. Tell Thomas to focus more on task performance behaviors.
d. Tell Thomas to focus more on democratic leadership.
e. Tell Thomas to focus more on social factors.
Based on the information given in the question, the answer will be for Thomas to focus more on task performance behaviors.
This will enable Thomas to know whether the employees in the department are performing their roles well or not. He already exhibits group maintenance behaviors and participative leadership. Therefore, option C will be the right answer.