According to Libet’s study, what is the order of events in a voluntary movement?

a. People form an intention, then activity begins in the premotor cortex, and finally the movement starts.

b. People form an intention at the same time that activity begins in the premotor cortex, and a bit later, the movement starts.

c. Activity begins in the premotor cortex, and a bit later, people are aware of forming an intention, and finally the movement starts.

d. Activity begins in the premotor cortex, and a bit later, people are aware of forming an intention, and simultaneously the movement starts.