This is true and false. It's formulated very confusing. I'd be more inclined to stay the statement is false because the theory of evolution didn't seem reasonable because we didn't know the complexity of living cells but rather because it was in line with the predicitons made by the theory and it made more epistemological sense that did creationism.
They can be single or multicellular and they are bigger than prokaryotes. They have a distinct nucleus and membrane-bound organelles, so that option would be incorrect. I hope this helped.
