In the given question, a word has been given and there are three ways in which the word has been used, in similar or different forms. You need to see which of the sentences have correctly used the highlighted word, and mark that as your answer. ARDENT
I. She gave an ardent speech about the importance of environmental conservation, inspiring everyone in the audience.
II. His ardent love for classical music was evident in the way he spoke about his favorite composers.
III. The ardent sun beat down on the desert, making it nearly impossible to endure the heat.

In Sentence I, 'ardent' is used correctly to describe someone who is passionate and enthusiastic about a cause, in this case, environmental conservation. In Sentence II, 'ardent' is used appropriately to describe strong feelings of love and enthusiasm, particularly for classical music. In Sentence III, 'ardent' is incorrectly used. 'Ardent' refers to a strong, passionate feeling, but it is not typically used to describe the sun's heat. The correct word here would be 'scorching' or 'blazing' to describe intense heat. Therefore, only Sentences I and II use the word correctly.