Caleb is researching the possibility of colonizing Mars. He found two sources for his topic. Read the two passages Caleb found.
Source 1: Science fiction author Michio Kaku has an idea about how Mars could become safe. In the future, robots could do the work to make the planet livable for plants, animals, and humans. Robot construction workers could build the cities of the future on the red planet.
Source 2: Paul Van Susante is an engineer. He believes that in the future we could make on Mars all the things we need to live there. However, he says that some advanced items or essential biological material may need to come from Earth.
Which statement could Caleb use to summarize and combine the information in both passages?
a) Robots will play an important role on Mars.
b) People will be able to grow different crops on Mars.
c) People will be able to produce different things on Mars.
d) People will need to import many types of goods to Mars.