human
Question: The metal lid on a glass jar is hard to open, so it is held under warm, running water. What causes the jar to open easily after it was held under the water?

Choices:
A) The water increased the pressure under the lid.
B) The jar shrunk with the warm water.
C) The water acted as a lubricant between the glass and the metal.
D) The metal lid expanded under warm water.
gpt
The correct answer is 3: The metal lid expanded under warm water..