Fact 1: Roundworms reproduce sexually. Fact 2: Nematodes are microscopic, true roundworms. Given the two facts above, which reproduce sexually?

(a). cacti;
(b). insects;
(c). Nematodes;
(d). Conifers;
(e). ferns;
(f). barnacles;
(g). Most plants;
(h). humans;
Answer:
(c).