Concept:Evaporation is the process of a liquid changing into vapour from its surface.
Its rate depends on factors that affect surface molecule escape.
Explanation:Evaporation occurs only at the liquid’s exposed surface.
Increasing the surface area exposes more molecules to escape, so the rate rises.
Hence option A is correct.
An increase in humidity reduces the concentration gradient, slowing evaporation.
A decrease in wind speed reduces removal of vapour above the surface, slowing evaporation.
A decrease in temperature lowers molecular kinetic energy, slowing evaporation.
Answer:A. an increase of surface area