Which of the following statements is CORRECT regarding the incidence of STDs?

A) Bacterial STDs are declining worldwide as a result of the ready availability of antibiotics.
B) The incidence of STDs is known with a high degree of accuracy.
C) Viruses transmitted by sexual contact are not widespread.
D) Viral STDs in the U.S. are considered epidemic.
E) The incidence of most STDs could be reduced by vaccination.