Q: Fact 1: Most invertebrates have a more complex nervous system. Fact 2: Invertebrates are animals without a backbone. Given the two facts above, what mostly have a more complex nervous system?

Pick from: (a). nerve cells; (b). protist; (c). animals without backbone; (d). remains of prehistoric life; (e). members of their own species; (f). sensory neurons; (g). Veins and arteries.; (h). bacteria;
A:
(c).