Final answer:
The faculty senate warned that if its recommendations were unheeded, the differences between the administration and the teaching staff would be aggravated and irreconcilable. In this context, if the faculty senate's recommendations were ignored, it would lead to an increase in the differences between the administration and the teaching staff, making the situation more difficult to resolve and eventually irreconcilable.
Step-by-step explanation:
The correct answer is a. Aggravated. The word 'aggravated' means to make a problem, situation, or condition worse or more serious. In this context, if the faculty senate's recommendations were ignored, it would lead to an increase in the differences between the administration and the teaching staff, making the situation more difficult to resolve and eventually irreconcilable.