Viking program

Target entity: Viking program
Context triple: [Viking 1, mission, Viking program]

• A. Voyager program
  The Voyager program is a NASA mission that launched the Voyager 1 and 2 spacecraft in 1977 to explore the outer planets and interstellar space, becoming one of humanity’s most significant and long-lived space exploration efforts.
• B. Viking 1
  Viking 1 was a NASA spacecraft that became the first successful lander on Mars, conducting detailed imaging and scientific experiments on the Martian surface starting in 1976.
• C. Vanguard program
  The Vanguard program was an early U.S. Navy–run satellite project during the Cold War that aimed to launch some of the first American satellites into Earth orbit as part of the International Geophysical Year.
• D. Constellation program
  The Constellation program was a canceled NASA human spaceflight initiative intended to develop new rockets and spacecraft for returning astronauts to the Moon and eventually traveling to Mars.
• E. Mariner program
  The Mariner program was a series of NASA robotic space missions in the 1960s and 1970s that conducted the first successful flybys and close-up studies of Venus, Mars, and Mercury.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Viking program
Target entity description: The Viking program was a NASA initiative in the 1970s that sent the first successful landers to the surface of Mars to conduct experiments and capture detailed images of the planet.

• A. Voyager program
  The Voyager program is a NASA mission that launched the Voyager 1 and 2 spacecraft in 1977 to explore the outer planets and interstellar space, becoming one of humanity’s most significant and long-lived space exploration efforts.
• B. Viking 1
  Viking 1 was a NASA spacecraft that became the first successful lander on Mars, conducting detailed imaging and scientific experiments on the Martian surface starting in 1976.
• C. Vanguard program
  The Vanguard program was an early U.S. Navy–run satellite project during the Cold War that aimed to launch some of the first American satellites into Earth orbit as part of the International Geophysical Year.
• D. Constellation program
  The Constellation program was a canceled NASA human spaceflight initiative intended to develop new rockets and spacecraft for returning astronauts to the Moon and eventually traveling to Mars.
• E. Mariner program
  The Mariner program was a series of NASA robotic space missions in the 1960s and 1970s that conducted the first successful flybys and close-up studies of Venus, Mars, and Mercury.
• F. None of above. chosen