Respiratory Syncytial Virus (RSV) Is a Human-Specific Virus That Causes

Respiratory syncytial virus (RSV) is a human-specific virus that causes infections of the lungs and respiratory tract and commonly infects infants and young children.In the young and immunosuppressed it can cause bronchiolitis and pneumonia.There are multiple strains of RSV, which has made it difficult to develop a protective vaccine.To better understand the evolution of different RSV strains, scientists should

A) use bioprospecting.
B) compare paralogs.
C) study cross-species transmission.
D) compare the genomes of old and new strains.
E) evaluate concerted evolution.