What does "volatile" describe?

The term "volatile" refers to something that is liable to lead to sudden change or violence. This can pertain to various contexts, such as emotions, markets, or chemical substances. In finance, for example, a volatile market is one that experiences rapid and unpredictable changes in price, leading to potential risks and opportunities. In a social or emotional context, a volatile person might display unpredictable and intense emotions, which can lead to sudden outbursts. Overall, "volatile" captures the essence of instability and the potential for unexpected reactions or transformations. This aligns precisely with the definition that characterizes something as prone to abrupt changes, making it the correct choice for the question.