If you are ________ the North Pole, every direction is south.

Correct answer: At

Short explanation: Being at the North Pole refers to a precise point on Earth. From that point, every possible direction you move is toward the south because all lines of longitude meet at the pole.

Why 'at' is the best preposition: 'At' is used to indicate a specific point or location. The North Pole is treated as a point, so 'at the North Pole' is correct.

• At — Correct: indicates a specific point; fits the North Pole usage. Also matches the geographic fact that every direction from that point is south.

• In — Incorrect: suggests being within an area or region, not at a precise point.

• Inside — Incorrect: emphasizes enclosure or being within something, which does not describe a single geographic point like the North Pole.

• Against — Incorrect: means touching a surface or being in opposition; it does not indicate location at a point.