What Were the Findings of Libet's EEG Study into Motor

What were the findings of Libet's EEG study into motor intentions?

A) Participants are unable to reliably report their intentions to act.
B) Participants report the intention to act before there is significant activity over the motor cortex.
C) Brain activity in the motor cortex increases before participants report an intention to act.
D) Changes in the motor cortex activity and reports of the intention to act occur at the same time.