In Comparing Smooth and Cardiac Muscle, Which One of the Following

In comparing smooth and cardiac muscle, which one of the following best describes the differences between the two muscle types?

A) Smooth muscle is voluntary, whereas cardiac is involuntary.
B) Both lack muscle filaments, but cardiac muscle has sarcomeres.
C) Cardiac muscle requires periods of relaxation, whereas smooth muscle is always in a state of partial contraction.
D) Cardiac muscle filaments are arranged in bundles, whereas smooth muscles lack filament bundles.
E) Cardiac muscle contracts slowly compared to smooth muscle.