Answer:
The correct answer is C. dullness and stupidity being regarded as admirable traits.
Step-by-step explanation:
What dotes the text with humour is the fact thet the speaker, a Monarch, is evaluating his son's cleverness as the criteria to select a new heir. The enumeration of his sons' traits would not be so funny if the king was not seriously thinking about them. He wants a good, intelligent king, but all his sons excell due to their stupidity, dullness, and other disadvantageous characteristics.