What are plate tectonics?​

a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.

Option (D)

Explanation:

The Neolithic era refers to the last stage of the stone age that started about 12000 years back. This era is marked by the development of agricultural activities. It was the time when the cultivation of cereals started and also the domestication of animals such as cows, goats and sheep were established. As the land areas that are closer to the rivers are highly fertile, so the early humans started to settle along the rivers in order to carry out the agricultural activities. Also, the river provides the irrigation facilities for farming purposes. They were able to grow crops like wheat, rice, and barley from then, on which they were dependent on.

Thus, the correct answer is option (D).