@smzeker931 Thank you! your comment helped me figure this out. I was misinterpreting the stimulus. I thought the flowers were developing colors to attract the bee's, instead of developing some other trait of bees visions.

If you're wondering, like me what the assumption is, a presumption is a type of assumption. We were taught in previous lessons that an assumption is not explicit, but in this case it is explicitly said. So I guess we have to watch out for that keyword.