What are the options? I’m confused sorry
The earth is rather large and not exactly a point in space, the author however is comparing it to a point in space because of how vast space really is. A metaphor is basically a comparison (Not exactly true) that doesn't use the words like or as... (That's a Simile.) The earth isn't an actual dot in space. It's big, but because of how big space is, it's compared to a dot... Hope this helps... :)
B: L'antagoniste s'oppose au protagoniste.