A scientist would build a model to observe what?
how cars are built
how the planets revolve around the sun
how high a dog can jump
how water boils and turns to steam
how the planets revolve around the earth.. since you can't approach some of them . which are far from the earth.. thus it is quite obvious that they should build a solar system and how planets integrate and move around the dynamic space time
How the planets revolve around the sun. This is the most known observation scientist would want to discover with a model and also the only accurate choice to make a model for. So answer B
Hope my answer is correct. Also hope this helps :)
