6506. He is quite meticulous in his dealings with others.

✅ The correct answer is option D.
Reserved : slow to reveal emotion or opinions.

Haughty : arrogantly superior and disdainful.

Indifferent : having no particular interest or sympathy; unconcerned.

Careful : making sure of avoiding potential danger, mishap, or harm; cautious.

Meticulous : showing great attention to detail; very careful and precise.

Synonym of Meticulous is Careful