Viruses can bud from:

Explanation

Viruses acquire their envelopes by budding through host cell membranes, with the plasma membrane being the primary site for many enveloped viruses like HIV and influenza. This allows the virus to incorporate host-derived lipids along with its own viral proteins into the envelope. In contrast, mitochondria are metabolic organelles and not used for budding, ribosomes lack membranes and only make proteins, and lysosomes are degradative organelles rather than exit sites. Therefore, the correct answer is that viruses form buds from the plasma membrane, while the other options are incorrect.