Read the excerpt from Moon Mission. Former astronaut Ken Bowersox is chair of NASA's Human Exploration and Operations Committee. He says Gateway encourages more-ambitious missions. "It's like a base camp on a mountain. When you build that, people are tempted to go higher, and they do go higher."

What central idea do the details in the excerpt support?

Ken Bowersox is an expert on space exploration.
The creation of Gateway causes people to dream big.
Former astronauts are often chairs of NASA committees.
The Human Exploration and Operations Committee plans missions.