What makes a good informative speech? An emotional quality
A strong argument
A well-written speech which presents facts
A persuasive speaker

All seem like great qualities, but I truly believe the best answer to this question is:

C) A well-written speech which presents facts

Explanation:

It's best that a speech is well written and grammatically correct. To make it easier for your audience to understand, use words and phrases suitable. For example, if you are a mayor, use professional vocabulary for the topic of the speech. On the other hand, if you are a preschool teacher teaching a class, still be somewhat professional, while also using words younger children (ages 2-6) will be able to understand (and it wouldn't hurt to be entertaining and bubbly so they won't get bored). Also, you want to be sure your speech contains 100% facts. You can do strong research on the topic you will be covering or speak to an expert who knows about it.

devin will have to drain the rain out from his garage.