The correct answer is: D. None of these
Haryana region was never merged with Punjab state. In fact, it was the other way around. In 1966, the Punjab Reorganisation Act was passed, which divided the state of Punjab into two new states: Punjab and Haryana. The Haryana region was carved out of the Punjab region and became a separate state.
The other options are incorrect because they are not the years in which Haryana region was merged with Punjab state. Option A, 1858, is the year in which the Indian Rebellion of 1857, also known as the Sepoy Mutiny, began. Option B, 1958, is the year in which the States Reorganisation Act was passed, which reorganized the states of India. Option C, 1757, is the year in which the Battle of Plassey was fought, which marked the beginning of British rule in India.