Which of These Is a Drawback of Single-Cell Recording

Which of these is a drawback of single-cell recording?

A) Single-cell recording does not allow researchers to monitor the activity of mirror neurons.
B) It requires surgical implantation of a needle in the brain, which makes it inappropriate for most human subjects.
C) Single-cell recording monitors the autonomic nervous system rather than a subject's conscious thoughts and actions.
D) It yields little data when used with research subjects who have epilepsy.