What might happen if the body does not address viral infections?

If the body does not effectively address viral infections, cells can multiply uncontrollably and spread throughout the body. This process can lead to the development of more serious conditions, such as tumors or other complications associated with viral infections. Viruses can manipulate host cells to replicate themselves, causing those infected cells to divide and proliferate, which may result in the invasion of healthy tissues and the ongoing spread of the infection.

In contrast, the other choices mention reactions that are either preventative or unrelated to the failure of the immune response in managing viral infections. For example, increased sun protection is a response to UV exposure rather than a consequence of viral infections. Similarly, skin becoming more elastic is not directly influenced by viral activity but rather relates to hydration and skin care factors, while building a stronger immune response reflects an adaptive mechanism against infections rather than a result of non-response.