Which of the following best explains why the ratios of A/T and G/C are 0.77 and 1.08,respectively in bacteriophage $\phi$ X174?

A)the base pairing in bacteriophages is not always A-T and C-G
B)studies done with most bacteriophages do not use complete genomic DNA due to the inherent instability of phage DNA
C)bacteriophage DNA often uses bases other than A,T,C and G
D)many viruses often use single stranded DNA
E)none of the above