Caleb is researching the possibility of colonizing Mars. He found two sources for his topic. Read the two passages Caleb found.

Source 1

Many people say Mars is cold and desolate, and there’s nothing to grow there. We can genetically modify plants and algae to thrive in the Martian atmosphere. But who’s going to do the heavy lifting? We all would like to see futuristic cities on Mars, but robots are going to become much more adapted to working in these harsh environments by the end of this century, so we expect to see robotic construction workers building the fantastic domed cities you see in science fiction novels.

–Michio Kaku,
Quoted in "There’s Only One Way for Humanity to Survive. Go to Mars,”
Simon Worrall

Source 2

"I think we could produce most of our things on Mars except perhaps the most sophisticated electronics and such,” says van Susante. "From a biological standpoint the picture is less clear since there may be trace elements and vitamins, that we would need to import.”

–Paul van Susante,
Quoted in "Could We Survive Without Our Planet?,”
Abigail Beall

Which statement could Caleb use to summarize and combine the information in both passages?

Robots will play an important role on Mars.
People will be able to grow different crops on Mars.
People will be able to produce different things on Mars.
People will need to import many types of goods to Mars