What does the 17th Parallel line separate?
(A) South and North America
(B) North and South Korea
(C) South and North Yemen
(D) South and North Vietnam

Hint
1. 38th parallel line: Demarcation between North and South Korea
2. Isthmus of Panama: Divides North and South America


Complete Solution Step by Step
1. The French invaded Indochina, a part of modern-day Vietnam, Cambodia, and Laos in the 19th century.
2. In the aftermath of the Second World War, the Imperial Japanese Army took Indochina from the French but was forced to accept it after suffering defeat by the Allied Armies.

3. The 1954 Geneva Agreement split Indochina into three countries: Laos, Cambodia, and Vietnam, which were split around the 17th parallel.
If half of Vietnam would be united was to be determined in both regions after the elections.

Paris Peace Accord
The Paris Peace Deal, negotiated by North Vietnamese politician Le Duc Tho and US President Nixon's National Security Advisor Henry Kissinger, was signed reluctantly by President Nguyen Van Thieu of South Vietnam in January 1973.

End of War
While several South Vietnamese units were able to protect Saigon, serving President Duong Van Minh (Thieu resigned a few days before the fall) ordered a surrender on 30 April 1975.
Saigon is said to have been spared from death.
Hundreds of thousands of South Vietnamese have left the country by any means possible: vehicles, fishing boats, barges, aircraft, helicopters, etc.

Aftermath
North and South Vietnam have united in a single communist (later reduced to changed socialism) republic.
The social order in South Vietnam has been restored.
Many low-ranking government employees have maintained their positions.
 Hanoi, the capital of North Vietnam, has been preserved as the capital of United Vietnam.
Saigon, the capital of South Vietnam, was called Ho Chi Minh City in recognition of the great emperor.

Option B. South and North Vietnam is the correct answer.

Note
1. Line of Actual Control: Demarcation line between India & China
2. Radcliffe Line: Demarcation line between India & Pakistan, India & Bangladesh
3. 9 Degree Channel: Separates Lakshadweep & Minicoy Islands
4. 10 Degree Channel: Separates the Andaman Islands And Nicobar Islands
5. Durand Line: Afghanistan and Pakistan
6. McMohan Line: North Eastern Part of India and China