The soil of Nagaland is generally:

The correct answer is: b) Deficient in nutrients.

The soil of Nagaland is generally deficient in nutrients. This is due to the fact that the soil is derived from the weathering of igneous rocks, which are not very rich in nutrients. Additionally, the soil is often acidic, which can further reduce the availability of nutrients. As a result, farmers in Nagaland often need to add fertilizer to their crops in order to achieve good yields.

Option a) is incorrect because the soil of Nagaland is not generally rich in nutrients. Option c) is incorrect because the soil of Nagaland is not highly fertile in valleys. Option d) is incorrect because the soil of Nagaland is not suitable for all crops.