Answer:
The protagonist is most likely to be the main character. They take the most action in the story and the central action. He/She is the one who solves the conflict. The antagonist can be a person, or thing. Antagonists are the ones who create the conflict. They are like "the bad guys".
For example:
Robby the red cat went out to have a picnic with his friend Mimi. They started to eat but then the weather turned to rain. Robby was upset until he had an idea. Why not have a picnic inside? So Mimi and Robby ate their picnic inside.
Protagonist- Robby
Antagonist- the rain