Which idea explains why sexual reproduction persists even under fairly stable conditions?

1. Every species evolves alongside its predators, prey, parasites and competitors. 2. Any advantage one species gains raises the pressure on the others. 3. A species that stops improving is outcompeted and can go extinct. 4. Sexual reproduction keeps supplying the variation needed to keep pace. 5. That argument is the Red Queen hypothesis, proposed by Leigh Van Valen in 1973. _Source: OpenStax Biology 1e (CC BY 4.0), Chs 10 and 11, section 11.2 Sexual Reproduction_