Simple phenomena of magnetism — practice question

The diagram represents the magnetic field around a bar magnet. How does the magnetic field strength change with position along the dotted path PRQ?

• AIt is constant along the path PRQ.
• BIt is strong at P and reduces in strength along the path PRQ.
• CIt is weak at P and increases in strength along the path PRQ.
• DIt is strong at P, decreases to a minimum at R and then increases towards Q.