The correct answer is B. Frank.
An ingenuous person is honest and straightforward, without trying to deceive or manipulate others. They are often seen as naive or innocent, but they are also genuine and trustworthy.
A cunning person is clever and resourceful, but they may also be deceitful and manipulative. They are often good at getting what they want, but they may not always be honest or fair in their methods.
A courteous person is polite and respectful, even to people they do not know or like. They are often good at making others feel comfortable and at ease.
A clever person is intelligent and quick-witted, and they may be good at solving problems or coming up with new ideas. However, they may not always be honest or straightforward in their methods.
In conclusion, the correct answer is B. Frank. An ingenuous person is honest and straightforward, without trying to deceive or manipulate others.