Step 1: Understanding AIDS.
AIDS (Acquired Immuno Deficiency Syndrome) is caused by HIV, which attacks the immune system, especially CD4 T-lymphocytes. The progression of the disease varies among individuals.
Step 2: Evaluating the options.
(A) AIDS does not spread through casual contact such as touching or sharing food.
(B) AIDS is not easily curable; it can only be managed with antiretroviral therapy.
(C) Some HIV-infected individuals, known as non-progressors, develop AIDS very slowly or may never develop it due to strong immune responses.
(D) HIV is not transmitted through insect bites.
Step 3: Conclusion.
The correct statement is (C), as it accurately describes the condition of non-progressors.