Which of the Following Is True of Internet-Based Health Interventions

Which of the following is true of Internet-based health interventions?

A) They are not helpful for those who do not have access to in-person programs.
B) Though the Internet helps deliver exercise and nutrition programs to large segments of the population, the costs associated with it are often prohibitive.
C) Controlled studies of the effectiveness of these interventions show that they are totally ineffective in helping people change their behaviors.
D) Many behavioral interventions of this nature aim to increase people's exercise and improve their diet.