Which of the following best describes someone who is 'ardent'?

The term 'ardent' is defined as showing strong enthusiasm or passion for something. When describing someone as ardent, it suggests that they are deeply committed and emotionally invested in their interests or beliefs. This aligns perfectly with the notion of being enthusiastic and passionate, which encapsulates the fervor and dedication that the term conveys.

In contrast, the other choices describe characteristics that are quite opposite to being ardent. For instance, being apathetic and indifferent indicates a lack of interest or enthusiasm, while being reserved and cautious implies a careful, restrained approach that does not resonate with the intensity associated with ardency. Lastly, being neutral and unbiased suggests an absence of strong feelings or passion towards any side of an issue, which further distances it from the passionate essence of what 'ardent' entails.