In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Q: Fact1: Protozoa can be classified on the basis of how they move., Fact2: Paramecium are protozoa, single celled animals., Question: What can be classified on the basis of how they move? (A) eggs (B) single celled animals (C) ovaries (D) microbes and mussels (E) snow, ice, and rock (F) melanin content (G) dermal & vascular tissue (H) reptiles ancestral to mammals
A:
B