Explanation:

- Haider Ali rose to prominence in the mid-18th century in the Mysore region.

- Option 1: 1760

- This is the correct answer. Haider Ali essentially became the de facto ruler around this time, when he effectively took control of the Mysore kingdom.

- Option 2: 1706

- This year is too early for Haider Ali’s rise to power. He was born in 1720, so he could not have become Sultan in 1706.

- Option 3: 1670

- This is also incorrect as it's before Haider Ali’s birth.

- Option 4: 1780

- By this time, Haider Ali was already well-established in power and had fought several battles as the ruler.