Which of these is NOT among the reforms related to agriculture undertaken under the five year plans?

Correct option is D

Among the options provided, (d) Formation of Rent Authority Department is NOT among the reforms related to agriculture undertaken under the five-year plans in India.
The other three options—(a) introduction of the policy of land to the tiller, (b) introduction of the Land Ceiling Act, and (c) launch of the high yielding variety seed technology—are all recognized agricultural reforms initiated during various phases of India's five-year plans to enhance agricultural productivity and equity.