Triple

Target entity: Demilitarized Zone between North and South Vietnam
Context triple: [I Corps Tactical Zone, South Vietnam, crossedBy, Demilitarized Zone between North and South Vietnam]

• A. Demilitarized Zone (Vietnam) chosen
  The Demilitarized Zone (DMZ) in Vietnam was the heavily contested buffer area around the 17th parallel that separated North and South Vietnam during the Vietnam War and became a major battleground despite its nominal neutral status.
• B. Korean Demilitarized Zone
  The Korean Demilitarized Zone is a heavily fortified buffer zone separating North and South Korea, symbolizing the ongoing division of the Korean Peninsula since the Korean War armistice.
• C. Vietnam–China border region
  The Vietnam–China border region is a mountainous, strategically vital frontier area between northern Vietnam and southern China that has long been a key theater for military campaigns and cross-border interactions.
• D. Aouzou Strip
  The Aouzou Strip is a mineral-rich border region in northern Chad that was long contested by Libya, becoming a central flashpoint in the Chadian–Libyan conflict before its sovereignty was resolved in Chad’s favor.
• E. North Korea–Russia border
  The North Korea–Russia border is a short, strategically important boundary in Northeast Asia that connects the two countries by land and river and plays a notable role in regional security and trade dynamics.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.