If a Ship Towing a Magnetometer Passes Over a Piece

Multiple Choice

If a ship towing a magnetometer passes over a piece of crust with a "normal" polarity,what will the magnetic anomaly look like?

A) The magnetic anomaly will be greater than Earth's.
B) The magnetic anomaly will be lower than Earth's.
C) The magnetic anomaly will exactly match Earth's.
D) The magnetic anomaly will be exactly zero.