The correct answer is option 1 - Robert Clive. Robert Clive, also known as Clive of India, was a British officer who played a significant role in expanding and establishing British control in India. In 1765, Clive introduced the diarchy system in Bengal. The diarchy system involved the division of power between a British governor and an Indian nawab, with the nawab having limited authority over internal affairs while the British retained control over major decisions and policies. This system aimed to maintain British control while also providing a semblance of Indian governance. It was a significant development in British colonial rule in India, marking the beginning of direct British involvement in administration and governance.