Correct Answer: (b) Due to the presence of high iron oxide
Solution:The presence of red colour in red soil is due to the presence of iron oxide in the soil. This soil is often deficient in nitrogen, phosphorus and humus. This soil is mainly found in Peninsular India, Andhra Pradesh and Tamil Nadu. In this soil, main coarse grains like jowar, millet, pulses, oilseeds and tobacco are cultivated.