Concept:The question tests the ability to identify the word most opposite in meaning to the underlined word and use it correctly in the sentence.Explanation:The word haughty means arrogant or excessively proud.Its direct opposite is humble, which means modest and not showing pride.The phrase "and not the ..." shows that the missing word must contrast with "haughty".Among the options, only humble gives this exact opposite meaning.Answer:D. humble