To "exacerbate" a problem means to:

To "exacerbate" a problem means to make it worse or intensify its severity. This term is often used in discussions about issues that are already problematic, where any additional actions or influences lead to further complications. For instance, a delay in addressing a health issue can exacerbate the problem, making recovery more challenging.

In this context, the other options do not align with the meaning of "exacerbate." Enhancing a solution implies improving a situation, acknowledging an issue refers to recognizing it without necessarily taking action, and ignoring it completely suggests a lack of engagement with the problem. Each of these actions contrasts with the idea of worsening a problem, which is precisely what exacerbating entails.