Hershey - Chase Experiment

I need some more information about the Hershey - Chase experiment, more specifically, why were viruses which infect bacteria chosen for the experiment?

This is homework help and is a multiple choice question. The options are:

a) Because they are organisms with very simple cellular structures.
b) Because they are easily cultured in a lab.
c) Because bacteriophages are composed of the same material as a chromosome, simply DNA and a protein coat.
d) Because they replicate and reproduce very quickly.
e) Because the infected bacteria are able to reproduce quickly.