Explanation:

- Option: 1 (2002)

- Jharkhand was not formed in 2002. This option is incorrect.

- Option: 2 (2001)

- Jharkhand was not formed in 2001. This is the incorrect year for the formation of the state.

- Option: 3 (2003)

- The state of Jharkhand wasn't formed in 2003. This option is also incorrect.

- Option: 4 (2000)

- Correct Answer: Jharkhand was formed in the year 2000.

- Jharkhand became the 28th state of India on November 15, 2000, after being carved out of the southern part of Bihar.

- This reorganization aimed at better economic development and addressing regional disparities within Bihar.

Therefore, the correct answer is Option: 4 (2000).