In addition to the development of sphincter muscle control, what other physical development must be ...

C

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A Incorrect: In addition to the development of sphincter muscle control, full-size bladder does not need to be complete prior to beginning bowel and bladder training in order for training to be successful.
B Incorrect: In addition to the development of sphincter muscle control, muscle development of the bladder does not need to be complete prior to beginning bowel and bladder training in order for training to be successful.
C Correct: In addition to the development of sphincter muscle control, myelinization of the spinal cord needs to be complete prior to beginning bowel and bladder training in order for training to be successful.
D Incorrect: In addition to the development of sphincter muscle control, full development of the abdominal muscles does not need to be complete prior to beginning bowel and bladder training in order for training to be successful.