Which of the following is listed in order from simplest to most complex?
A. mitochondrion, muscle cell, smooth muscle tissue, esophagus, digestive system
B. muscle cell, mitochondrion, smooth muscle tissue, esophagus, digestive system
C. mitochondrion, muscle cell, esophagus, smooth muscle tissue, digestive system
D mitochondrion, smooth muscle tissue, muscle cell, esophagus, digestive system