The Hardy-Weinberg assumptions for population species to be at equilibrium are that there mustn't be random mating and hence no sexual selection, no gene flow between different species populations, a big sized population (which theoretically would tend to an infinite amount of organisms), no mutations in their genome, and no natural selection. Having this clear, we can say that the correct answers are the following:
Forces that aren't acting for evolutionary change to not occur:
B. mutations occurring
C. natural selection occurring
D. random mating