Cambodia is located in the southern portion of the Indochina Peninsula.
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I would go with number one, because that's the only option that isn't negative.
Explanation:
The western and central European section of the plain covers all of western and northern France, Belgium, The Netherlands, southern Scandinavia, northern Germany, and nearly all of Poland; from northern France and Belgium eastward it commonly is called the North European Plain.
Which countries are an option?