The correct answer is 'scarcity.' Key Points - Let us see the meaning of Plenty: - Plenty: a situation in which food and other necessities are available in sufficiently large quantities. - Example: Still, she had plenty to do. - Let us see the meanings of the given options: - Ugliness: the quality of being unpleasant or repulsive in appearance. - Scarcity: the state of being scarce orin short supply; shortage. - Roughness: the quality or state of having an uneven or irregular surface. - Dryness: absence or lack of moisture or liquid. - From the meanings of the given words, we can say that the word 'scarcity' is the opposite of the meaning of the underlined word 'plenty'. - Hence, the correct answer is 'scarcity.'