Which of the Following Processes Is a Simple Dissolution

Multiple Choice

Which of the following processes is a simple dissolution?

A) Adding iodine crystals to CCl₄
B) Mixing an aqueous solution of NaOH with an aqueous solution of HCl
C) Bubbling HCl gas through water
D) SO₃ gas dissolving in water to produce sulfuric acid.
E) Adding sodium metal to ethanol to produce sodium ethoxide and hydrogen gas