All of the Following Statements Are True EXCEPT

All of the following statements are true EXCEPT:

A) catalytic converters can become plugged if they operate for a prolonged period when there is a misfire.
B) as a general rule, exhaust backpressure should not exceed 3.75 psi at wide-open throttle (WOT) under full load.
C) a rich air-fuel mixture can result in a plugged converter when it overheats and melts internally.
D) exhaust backpressure can be tested by removing the oxygen (O₂) sensor and connecting a pressure tester using a special fitting.