Fact 1: Most protists have motility. Fact 2: Protists are one celled organisms. Given the two facts above, what can have motility?

Options are: 1). Small things with a microscope 2). gastropod shells 3). members of their own species 4). one celled organisms 5). Something to move 6). mitochondria 7). rocks 8). intestines
Answer:
4).