In an Electrically Conducting Polymer,what Is a "Hole

Multiple Choice

In an electrically conducting polymer,what is a "hole"?

A) It is a region of negative charge.
B) It is a delocalized π electron.
C) It is an antibonding π molecular orbital.
D) It is a π molecular orbital from which a π electron has been abstracted.
E) It is an ion,such as I₃^-,added to increase the conductivity of the polymer.