If a Solid Piece of Shiny Sodium Metal Is Exposed

If a solid piece of shiny sodium metal is exposed to chlorine gas,a large amount of heat is released and the white solid sodium chloride (table salt) forms.Based on this information,which of the following statements is TRUE?

A) This process represents a physical change.
B) Mass is lost during this process.
C) Sodium chloride is an element.
D) This process was exothermic.
E) none of the above