Answer: D. Boiling takes place throughout a liquid, while evaporation takes place at the surface.
Explanation: Boiling is a phenomenon in which liquid convert to gaseous state at the boiling temperature of the substance. Evaporation is also a phenomenon in which liquid convert to gaseous state but at any temperature lower than its boiling point.
Boiling is a bulk phenomenon , which means it takes place throughout the liquid whereas evaporation is a surface phenomenon and takes place only at the surface.