When you have a question, and you have multiple suggestions, you have to put it in the same answer. Why can't SE sites allow you to answer a question more than once?
Some sites - notably Software Recommendations actually encourage this in some circumstances.
Practically though, in most situations, unless you're aware of dramatically different solutions (not mere suggestions), that the community at large may weigh differently, you shouldn't need to.
As such a prohibition on multiple answers is by the community, not by the mechanics of the site.
I may or may not, sometimes abuse this on site metas as a poor mans polling system.