The type of muscle that contains intercalated discs is cardiac muscle.
Intercalated discs are unique structures found in cardiac muscle tissue. They are specialized cell junctions that facilitate the synchronized contraction of the heart. These discs contain gap junctions, which allow electrical impulses to spread quickly between cardiac muscle cells, ensuring that the heart beats in a coordinated manner.
In contrast, skeletal muscle and smooth muscle do not have intercalated discs. Skeletal muscle is responsible for voluntary movements and is characterized by its striated appearance. Smooth muscle, found in the walls of hollow organs like the intestines and blood vessels, is responsible for involuntary movements and lacks striations.
Therefore, the correct answer is c) cardiac.