Answer:
The correct answer is - plasticity.
Explanation:
Neuroplasticity, brain plasticity or plasticity of the brain is the ability of brain to develop of change throughout the life. In this case peter suffers damage or injury in his frontal lobe that stores learned ability.
As he lost ability of speak however still can understand the speech and he is still able to recover as brain has neuroplasticity that helps in recovering the lost function.
Thus, the correct answer is - plasticity.