Which Mars mission landed on Mars in 1997?

• A. Pathfinder
• B. Viking 1
• C. Mars Odyssey
• D. Opportunity

Answer: (A)

Mars Pathfinder is the mission that landed on Mars in 1997. It arrived on July 4, 1997, and carried the Sojourner rover, making it the first mission to deploy a rover on the Martian surface. Viking 1, launched much earlier, landed in 1976. Mars Odyssey launched in 2001 and operates as an orbiter, not a lander. Opportunity landed in 2004 as part of the Mars Exploration Rover mission. So Pathfinder is the correct answer because it is the 1997 Mars landing among the options.