Triple

Target entity: Chinese 1979 punitive campaign against Vietnam
Context triple: [Battle of Lạng Sơn, partOf, Chinese 1979 punitive campaign against Vietnam]

• 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. 1975 Spring Offensive
  The 1975 Spring Offensive was the final large-scale military campaign by North Vietnamese forces that rapidly led to the collapse of South Vietnam and the end of the Vietnam War.
• C. Battle of the Paracel Islands
  The Battle of the Paracel Islands was a 1974 naval clash between China and South Vietnam that resulted in Chinese control over the disputed Paracel archipelago in the South China Sea.
• D. Sino–Soviet border conflict
  The Sino–Soviet border conflict was a series of armed clashes in 1969 between the Soviet Union and the People’s Republic of China along their disputed frontier, marking the peak of tensions in the Sino–Soviet split.
• E. 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.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.