Which of the following statements is true regarding $AIDS$?

• A
  $HIV$ infection spreads by eating food with an $AIDS$ patient.
• B
  Individuals who use intravenous drugs are less likely to get $HIV$ infection.
• C
  An $AIDS$ patient can be $100\%$ cured if given proper care and nutrition.
• D
  $HIV$ is a retrovirus that enters $T_H$ cells and reduces their number.