Final answer:
The city of Cairo is approximately located at 30° N, 31° E, which is the set of coordinates precisely indicating its geographic location.
Step-by-step explanation:
The closest approximate location for the city of Cairo is A. 30° N, 31° E. This set of coordinates almost accurately describes Cairo's geographic location on Earth.
The latitude and longitude of a location tell us its exact position on the Earth's surface. Latitude is the distance north or south of the equator, while longitude is the distance east or west of the Prime Meridian. Cairo, being in Egypt, is located to the north of the equator and to the east of the Prime Meridian. The other options provided do not accurately describe the position of Cairo as they refer to locations that are either too far east or not correctly aligned with Cairo's actual position.