Triple

Target entity: Chinese invasion of Vietnam (1979)
Context triple: [Battle of Lạng Sơn, relatedTo, Chinese invasion of Vietnam (1979)]

• A. Sino-Vietnamese War chosen
  The Sino-Vietnamese War was a brief but intense 1979 border conflict in which China launched a punitive invasion of northern Vietnam, leading to heavy casualties and lasting regional tensions.
• B. Cambodian–Vietnamese War
  The Cambodian–Vietnamese War was a late-1970s conflict in which Vietnam invaded Cambodia, overthrew the Khmer Rouge regime, and installed a new government, leading to prolonged regional instability and international tensions during the Cold War.
• C. Nguyen Hue Offensive
  The Nguyen Hue Offensive, better known as the Easter Offensive, was a major 1972 North Vietnamese conventional military campaign against South Vietnam during the Vietnam War.
• D. First Indochina War
  The First Indochina War was a conflict from 1946 to 1954 between French colonial forces and the Viet Minh that led to the end of French rule in Indochina and set the stage for the Vietnam War.
• E. Vietnam Counteroffensive campaigns
  The Vietnam Counteroffensive campaigns were a series of major U.S. and allied military operations conducted during the Vietnam War aimed at regaining the initiative against communist forces and expanding control over contested regions.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.