Final answer:
The depth of the Kola Superdeep Borehole SG-3 in kilometers is 12.262 km, which is achieved by dividing the depth in meters (12,262 m) by 1,000.
Step-by-step explanation:
The record depth of the Kola Superdeep Borehole SG-3 is 12,262 meters. To convert the depth from meters to kilometers, you divide the number of meters by 1,000 since 1 kilometer equals 1,000 meters. Therefore, 12,262 meters divided by 1,000 equals 12.262 kilometers.
So, the correct answer is a) 12.262 km.