While Discussing Intake Seals, Technician a Says That a Faulty

While discussing intake seals, Technician A says that a faulty intake valve seal will allow oil to be pulled into the cylinder from the low pressure created during the intake stroke. Technician B says that a leaking intake seal can cause carbon buildup on the valve stem, which interferes with engine breathing. Who is correct?

A) A only
B) B only
C) Both A and B
D) Neither A nor B