Natural selection
is random
favors organisms well adapted to the environment
cannot work if beneficial traits are not hereditary
is often called survival of the fittest

B) favors organisms well adapted to the environment.
Not positively sure about my answer because I haven't read about this since two years ago in biology.

When a virus infects a host cell, it uses the cell's machinery to make copies of its own genetic material in a process called replication. finally, during the process of self-assembly, that protein shell and the copies of the virus's genetic material are assembled into new viruses.