What are viruses highly resistant to?

Viruses are known to exhibit a high level of resistance to various environmental conditions and treatments. Acidification, which involves changing the pH level to a more acidic environment, does not typically affect the stability of viruses, allowing them to survive in foods that might be acidified for preservation. High sugar concentrations can create an osmotic pressure that affects bacteria and other microorganisms, but viruses are not significantly impacted by sugar, thus maintaining their viability in such environments. Irradiation is a method used to kill pathogens in food through exposure to ionizing radiation. However, viruses can often remain intact after such treatment because they lack the cellular structure that could be disrupted by radiation.

Considering these attributes, it becomes clear that viruses are indeed highly resistant to all three conditions: acidification, high sugar concentrations, and irradiation, making the choice that encompasses all of these factors the most accurate.