Which of the Following Features Distinguishes Cardiac Muscle from Skeletal

Which of the following features distinguishes cardiac muscle from skeletal muscle?

A) Cardiac muscle contraction is modified by hormones.
B) Cardiac cells lack T tubules.
C) Only cardiac muscle has slow myosin ATPase activity.
D) In skeletal muscle Ca²⁺ is released from the sarcoplasmic reticulum.
E) Skeletal muscle has thick myosin and thin actin filaments