Option 1: Knowledgeable -> relates to having knowledge or information, not connected to respect or rudeness.
Option 2: Caring -> means showing concern for others, but doesn't directly oppose the concept of rudeness.
Option 3: Respectful -> means showing politeness and regard for others, the direct opposite of being rude or disrespectful.
Option 4: Insensitive -> means lacking concern for others' feelings, which is similar to rather than opposite of impudent.
Hence, Option 3: Respectful -> "Impudent" means rude, disrespectful, or showing a lack of proper respect, so "respectful" (showing courtesy and regard) is its perfect antonym -> correct