Answer: D. Alpha and beta particles pose little or no hazard to human health.
Explanation: While they pose no direct threat, alpha and beta particles may be capable of causing serious health concerns if ingested or inhaled. As a matter of fact, some beta particles are capable of penetrating skin tissue and causing serious damage such as skin burns. On the other hand, if alpha particles are inhaled, swallowed, or get into the body through a cut, the alpha particles can damage sensitive living tissue.
