Option 1: Option 1 is not an example of an endothermic reaction. It is important to note that endothermic reactions absorb heat from the surroundings.

Option 2: This is the correct answer. A reaction that absorbs heat from the surroundings is considered endothermic. An example of an endothermic reaction is the photosynthesis process in plants, where carbon dioxide and water are converted into glucose and oxygen. This reaction requires energy from sunlight to occur, absorbing heat in the process.

Option 3: Option 3 is not an example of an endothermic reaction. It is important to remember that endothermic reactions involve the absorption of heat.

Option 4: Option 4 is not an example of an endothermic reaction. Endothermic reactions absorb heat, while exothermic reactions release heat.

In conclusion, option 2 is the correct answer as it exemplifies an endothermic reaction where heat is absorbed from the surroundings.