The territory which serves as a US air force base is Wake island option(a) is correct.
What is territory?
In simple words territory is defined as the region which is basically an geographical area under the jurisdiction or it can be said a land which is connected to belonged to a particular person.
Wake island airfield is known to be as the military air base which is gradually located on the wake island it is actually owned by the US air force.
Therefore option(a) is correct.
The complete question is given in the image attached below.
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