A Species Is Found to Infect Host Fishes in Isolated

A species is found to infect host fishes in isolated mountain lakes.The host range is

A) impossible to determine, because the isolated lakes don't allow tests for the infection of other fishes.
B) All of these definitions are applied by researchers, depending on the particular viruses of concern.
C) the mountainous area, in which the isolated lakes are found and mapped.
D) the one or more infected species of fishes that exhibit the viral disease symptoms.
E) the specific sizes and shapes of the fish tissue cells that become infected by the viruses.