Which of the Following Statements About the Use of Sodium

Which of the following statements about the use of sodium is FALSE?

A) Sodium vapor lamps are used outdoors.
B) Sodium is used in reactors because it has a low melting point.
C) Sodium is used in reactors because it has a high boiling point.
D) Sodium is used in reactors because it has a high thermal conductivity.
E) A typical sodium vapor lamp uses several grams of sodium.