Correct Option: B

If the poured liquid is relatively hotter or colder in comparison to the tumbler, it will break. When hot water is poured into a tumbler there is an uneven increase in the thermal expansion of the walls of the vessel. If the expansion is uneven enough and the strength of the glass is not strong enough, the tumbler breaks. However, if the poured water is colder in comparison to the tumbler, it breaks due to contraction and unequal temperature difference between the layers.