Evaporation of a liquid correctly describes the effect or change asked about in this question. In Thermodynamics, understanding cause-and-effect relationships is essential for predicting biological outcomes. Evaporation of a liquid occurs because of specific molecular interactions, thermodynamic principles, or regulatory mechanisms that govern this biological process. The other options (Gas condensing into a liquid, Water freezing, and Formation of a solid crystal) describe either opposite effects, effects that occur under different conditions, or changes associated with unrelated processes.
Ref:
Lehninger Principles of Biochemistry, Nelson & Cox, 8th Ed., Ch. 1