Final answer:
The freezing of water is the exothermic process among the options because it releases heat into the surroundings when liquid water turns into ice.
Step-by-step explanation:
The question asks which process is exothermic among the given options. An exothermic process is one that releases heat. To evaluate the options provided, let's consider the nature of each process:
- Freezing of water is exothermic because it releases heat into the surroundings when liquid water turns into ice.
- Sublimation of dry ice (solid CO2 becoming gas) is an endothermic process because it absorbs heat from the surroundings.
- Boiling of soup is also an endothermic process as it requires the absorption of heat to convert liquid into vapor.
- Melting of copper is an endothermic process as heat is required to change solid copper into liquid form.
Therefore, among the options provided, the freezing of water (A) is the exothermic process.