Water can be made to boil at 105 degrees Celsius instead of 100 degrees Celsius by

a. applying a great deal of heat.

b. increasing the air pressure on the water.

c. decreasing the air pressure on the water.

d. removing a great deal of heat.

The answer to the question is letter 'C', water can be made to boil at 105 degrees Celsius by decreasing the air pressure on the water. Boiling occurs when the water is hot enough to have the same pressure as the surrounding air. at high altitudes the air pressure is lower than the sea level, it possible that the boiling of water can be raise until 105 degrees.