Wilder Penfield's Research on the Localization of Function in the Brain

Wilder Penfield's research on the localization of function in the brain demonstrated that when Broca's area is stimulated in a conscious person,

A) the effect is always the same; namely that the ability to understand language is disrupted.
B) the effect is always the same; namely that the ability to produce language is disrupted.
C) although the effect may be varied, depending on the individual being stimulated, it will likely be related to linguistic abilities.
D) although the effect may be varied, depending on the individual being stimulated, it will likely be related to non-linguistic abilities.