What type of noise will be caused by a piston slap?

A) A sharp, metallic rapping noise that occurs with the engine idling.
B) A hollow, bell-like noise that is most often occurring during cold engine warmup
C) A light, rapping noise at speeds above 35 mph.
D) A heavy thumping knock when the engine is first started

Piston slap is a condition where there is excessive clearance between the piston and the cylinder wall, causing the piston to "slap" against the wall during operation. This typically produces a hollow, bell-like noise, most often occurring during cold engine warmup when the components have not yet expanded to their operating clearances.