On a hot day, a glass containing ice water slowly collects liquid on the outside of the glass. Which statement best explains where this liquid come from?

Question

$\begin{array}{1 1} \text{A.Air molecules outside of the glass turned to liquid on the outside surface of the glass.} \\\text{B.Water from the inside of the glass seeped to the outside of the glass.} \\ \text{C.Water vapor from the air outside of the glass condensed on the outside surface of the glass.} \\ \text{D.Water from inside the glass and water from the air outside the glass combined on the outside of the glass.} \end{array} $