Final answer:
John's reaction to his mother's death would be considered inappropriate if he laughs uncontrollably.
Step-by-step explanation:
The appropriateness or inappropriateness of one's reaction to the death of a loved one is subjective and can vary depending on cultural, individual, and personal factors. However, based on the provided options, John's reaction to his mother's death would be considered inappropriate if he laughs uncontrollably. Laughing uncontrollably in response to the death of a loved one may be seen as disrespectful, insensitive, or even abnormal by many people.