Final answer:
Max means that his dad is not a knight or a warrior.
Step-by-step explanation:
When Max says that his dad doesn't need a suit of armor, a horse, or a lance, he means that his dad is not a knight (option a). In medieval times, knights were known for wearing armor and riding horses, carrying lances as weapons. By stating this, Max is emphasizing that his dad doesn't fit the stereotype of a knight or a warrior.