Many Antibiotics, Especially for Viruses and Cancer Therapy Involve Inhibition

Many antibiotics, especially for viruses and cancer therapy involve inhibition of folic acid reactions, especially because folic acid is essential for this reaction:

A) Synthesis of many amino acids.
B) Conversion of uracil to thymine for DNA synthesis.
C) Synthesis of deoxyribose for DNA synthesis.
D) None of these reactions explains the reason why inhibitors of folic acid act as antibiotics.
E) All of these reactions are reasons why inhibitors of folic acid act as antibiotics.