After incubating the plates from condition 2 for an additional 5 days, ... ...

After incubating the plates from condition 2 for an additional 5 days, the plates became totally clear. What is the most likely explanation for this result?
(A) Newly produced phages infected all bacteria on the dish, thus killing everything.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 07. Viruses