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The correct answer is option 3, Laos.
To understand why Laos is the land-locked country among the given options, we need to know the definition of a land-locked country. A land-locked country is a country that does not have a coastline or any access to the ocean or sea. It is surrounded completely by land.
Option 1, Vietnam, is not a land-locked country as it has a coastline along the South China Sea.
Option 2, Cambodia, is not a land-locked country either as it has access to the Gulf of Thailand.
Option 4, Thailand, is also not a land-locked country as it has coastlines on the Andaman Sea and the Gulf of Thailand.
Therefore, based on the given options, Laos is the only land-locked country as it is completely surrounded by land and does not have access to any sea or ocean.