The correct answer is 'straightforward.' Key Points - Let us see the meaning of Crooked: - Crooked: dishonest. - Example: He is a crooked police officer. - Let us see the meanings of the given options: - Polite: having or showing behaviourthat is respectful and considerate of other people. - Generous: showing a readiness to give more of something, especially money, than is strictly necessary or expected. - Straightforward: uncomplicated and easy to do or understand, honest. - Happy: feeling or showing pleasure or contentment. - From the meanings of the given words, we can say that the word 'straightforward' is the opposite of the meaning of the underlined word 'crooked'. - Hence, the correct answer is 'straightforward.'