Metabolically, archaea

A) are all photosynthetic.
B) are all heterotrophic.
C) can be heterotrophic or autotrophic.
D) are all parasitic.

Heterotrophic

An organism that obtains its energy and carbon by consuming other organisms, unable to produce its own food.

Autotrophic

Organisms capable of synthesizing their own food from inorganic substances using light or chemical energy.

Parasitic

Pertaining to organisms that live on or in a host organism and cause harm to their host.