Final answer:
A destructive program that replicates itself throughout a single computer or across a network is called a w0rm. So, the option C.
Step-by-step explanation:
This type of malware differs from a virus because it can propagate without the need to attach itself to an existing program. Viruses and w0rms are both forms of malware, but w0rms are particularly notable for their ability to spread across networks on their own.
Additionally, to further answer the bracketed questions, another name for a nonenveloped virus is a n4ked virus. This type refers to viruses that lack a lipid envelope around their protein coat. Regarding the most widespread virus in the human population, the answer would vary depending on the context and current epidemiological data, but historically, viruses like the common cold and influenza have had wide prevalence among humans.
Therefore, C. Worm is the best option.