Choose the best answer to the of the following. Explain your reasoning with one or more complete sentences.
Based on the observational evidence, is it possible that dark matter doesn’t really exist? (a) No, the evidence for dark matter is too strong for us to think it could be in error. (b) Yes, but only if there is something wrong with our current understanding of how gravity should work on large scales. (c) Yes, but only if all the observations themselves are in error.