The correct answer is D. 1974.
The Jharkhand Party was formed in 1957 by Shibu Soren and others to demand a separate state for the tribal people of Jharkhand. The party submitted a memorandum to the government of India in 1974, demanding a separate state for the tribal people of Jharkhand. The government of India rejected the demand, but the Jharkhand Party continued to agitate for a separate state. In 2000, the government of India finally agreed to create a separate state for the tribal people of Jharkhand. The state of Jharkhand was created on November 15, 2000.
Option A is incorrect because the Jharkhand Party was not formed until 1957.
Option B is incorrect because the Jharkhand Party did not submit a memorandum consisting of the demand for a separate state until 1974.
Option C is incorrect because the Jharkhand Party did not submit a memorandum consisting of the demand for a separate state in 1965.