At a point $A$ on the earth’s surface the angle of dip, $\delta =+25°$. At a point $B$ on the earth’s surface, the angle of dip, $\delta =-25°$. We can interpret that:

• A

  $A$ and $B$ are both located in the northern hemisphere.
• B

  $A$ is located in the southern hemisphere and $B$ is located in the northern hemisphere.
• Correct answer
  C

  $A$ is located in the northern hemisphere and $B$ is located in the southern hemisphere.
• D

  $A$ and $B$ are both located in the southern hemisphere.

Hence, the correct answer is option: 'C'.