Concept:A prismatic compass relies on the Earth’s magnetic field.
Any disturbance to this field can cause incorrect readings.
Explanation:Magnetic attraction from iron, steel, or other magnetic objects pulls the compass needle.
This force makes the needle point in the wrong direction.
As a result, the prismatic compass gives an inaccurate reading.
A big tree, wind direction, or a pond do not influence the magnetic needle.
Therefore, they cannot cause wrong compass readings.
Answer:D. MAGNETIC ATTRACTION