Pavan separates some materials into two groups and notes their properties. These properties are given in the table below:

Group $1$	Group $2$
They cannot be beaten into sheets.	They can be beaten into sheets.
When one end is in contact with a hot object,the other end does not get hot quickly.	When one end is in contact with a hot object,the other end gets hot quickly.
They cannot be drawn into thin wires.	They can be drawn into thin wires.

Which of the following statements cannot be false?

• A
  Materials in Group $1$ are generally not lustrous and hard.
• B
  Materials in Group $1$ generally have lower density than materials in Group $2$.
• C
  Materials in Group $2$ can be used to make bells.
• D
  Materials in Group $2$ can be used to make materials that are insulators of electricity.