Correct Answer: furious

Solution : The correct option is the first option.

Explanation:
Furious means extremely angry or full of rage, which fits well in the context of someone who gets angry over petty issues regularly. It conveys a strong sense of anger and intensity.
The meanings of the other options are as follows:

• Fierce typically refers to something intense, powerful, or strong, often associated with aggression.
• Heated implies a high level of emotional intensity or passion in a discussion or argument.
• Violent implies a tendency towards physical force or aggression.

Therefore, the correct sentence would be: "My uncle is a colonel who gets furious over petty issues every now and then."