4. Where is the magnitude of force around this object the greatest? C
A. The magnitude is greatest close to the poles.
B. The magnitude is greatest far from the poles.
C. The magnitude is equal at all points on the field.
D. The magnitude is greatest halfway between poles.

Actually Welcome to the Concept of the Magnetism.

Since any magnetic object like true magnets, permanent magnets and solenoids always have a magnetic field lines around them that , originate from North Pole and Drive to South Pole, hence,

The most intensive and strong magnetic field are close to the poles.

A. is the correct answer.

===> A. The magnitude is greatest close to the poles.