Answer:
D. Tapeworms.
Step-by-step explanation:
Toxoplasmosis is a disease that is a result of interaction with a bacteria that bears a similar name. Amoebae are unicellular organism that can change shape. Malaria is a disease that is primarily spread by infected mosquitos. Tapeworms are a type of worm/parasite that comes from eating or drinking contaminated food and/or drink that can live for 20 years and grow to 50 feet in length. The only one that matches the question description is tapeworms, so that'd be the answer.