At hill station, the boiling point of water will be _________.

Less than that at sea level

The correct answer is Option (3) - Less than that at sea level

At a hill station, the boiling point of water will be less than that at sea level. This is because the boiling point of water decreases with an increase in altitude. As you go higher above sea level, the atmospheric pressure decreases, and since boiling point is directly related to atmospheric pressure, water boils at a lower temperature.