Technician a Says Thumps and Grinding Noises Are Often Caused

Multiple Choice

Technician A says thumps and grinding noises are often caused by bad thrust washers. Technician B says that noise that is related to engine speed and occurs in all gear ranges, including park and neutral, is likely caused by a bad planetary gearset. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B