Which statement is the best example of a supporting reason for this claim?
Claim: Sending people to Mars is not a practical course of action.
A. Scientists know more about Mars than any other planet in the
solar system because it's easy to visit.
B. The effort to visit Mars would result in many important scientific
discoveries that would help all people.
O C. A trip to Mars would cost trillions of dollars and require
technologies that don't yet exist.
O D. To reach Mars, engineers must design a spacecraft that can block
radiation for a multi-month journey.
