Route of entry for canine distemper virus is
This outcome reflects microbial physiology, where growth regulation and host interactions follow molecular programs. Option B captures this correctly because it corresponds to prokaryotic strategies, consistent with textbook descriptions and experimental observations in microbiology.
Ref: Madigan et al., Brock Biology of Microorganisms, 15th Edition, Chapter 13, Virology, explains viral replication and virus-host interactions detailing microbial genetics.
