The correct answer is A. January, 1960.
Rohtak was formed in January 1960, when it was separated from the Gurgaon district. It is the headquarters of Rohtak district in the Indian state of Haryana. The city is located on the banks of the Yamuna River, about 100 kilometers (62 mi) north of Delhi. Rohtak is a major industrial and commercial center, and is home to a number of educational institutions, including the Maharshi Dayanand University.
The city has a long and rich history. It was founded by the Tomar Rajputs in the 11th century, and was later ruled by the Mughals, the Marathas, and the British. Rohtak was an important center of the Indian independence movement, and was the site of a number of protests and demonstrations against British rule.
Today, Rohtak is a thriving city with a population of over 1 million people. It is a major center of education, industry, and commerce. The city is well-connected to other parts of India by road, rail, and air.
Option B is incorrect because Rohtak was not formed in November 1966.
Option C is incorrect because Rohtak was not formed in October 1990.
Option D is incorrect because Rohtak was not formed in December 2000.