A. deforestation and over-grazing
A.
B. the presence of potash and magnesia
B.
C. tropical monsoonal climate
C.
D. a wide diffusion of iron in ancient crystalline and metamorphic rocks
D.
Correct Answer: D
সঠিক উত্তর: D
Explanation
ব্যাখ্যা
Red soil develops its reddish color due to the diffusion of iron in ancient crystalline and metamorphic rocks. The soil's color is also due to its high iron and calcium carbonate content.