My fan is turned up to 11

You’ve had your computer for a couple of years, and you’ve noticed recently that the fan inside of the case is running more often and at higher rates of speed. What is the most likely cause of this issue?

A) All fans run faster as time goes on

B) The internal temperature sensors are faulty

C) The fan controller software is faulty

D) The airflow through the computer is blocked

E) The fans are attempting to fly away with your computer. Tie your computer to the floor!