Option 1 states that both boiling and evaporation are surface phenomena. Boiling is the process in which a liquid rapidly vaporizes, forming bubbles of vapor throughout the liquid. It is not limited to the surface, as it occurs throughout the body of the liquid. On the other hand, evaporation is the gradual conversion of a liquid into a gas, usually occurring at the surface. Therefore, option 1 is incorrect.

Option 2 states that boiling is a surface phenomenon, but evaporation is a bulk phenomenon. This is the correct answer. Boiling occurs throughout the liquid and involves the formation of bubbles, while evaporation primarily occurs at the surface.

Option 3 states that both boiling and evaporation are bulk phenomena. This is incorrect as boiling is not limited to the bulk of the liquid; it involves rapid vaporization throughout the liquid.

Option 4, which is the correct answer, states that boiling is a bulk phenomenon, but evaporation is a surface phenomenon. As explained earlier, boiling occurs throughout the liquid, while evaporation typically occurs at the surface.

Therefore, option 4 is the correct answer.