Which of the following statements is TRUE about parasites and their relationships with their hosts?

• A. The parasite and the host enjoy a mutual relationship, where both organisms benefit.
• B. The parasite enjoys the benefits of a relationship in which the host is harmed or killed.
• C. The host enjoys the benefits of a relationship in which the parasite is harmed or killed.
• D. Neither the parasite nor host is really harmed in their symbiotic relationship.