ANS:A - True

Yes I agree carbon is a semiconductor,because it is a IV-group element. .in which 4 valance electrons are present. BUT all the type of carbon are not semiconductors.

It will be on all three(conductor,insulator,semiconductor) forms.

NOTE:
# "DIMOND" is a carbon component which is "INSULATOR"
# "GRAFITE" is a carbon composition which is "CONDUCTOR"
# "POWDERED CARBON" is a carbon composition which is "SEMICONDUCTOR".