The correct option is C Progressive degeneration of the spinal nerves and wasting of the muscles that they control.
Muscular atrophy describes another group of diseases which cause a progressive degeneration of the spinal nerves and wasting of the muscles that they control.
Muscle hypertrophy is a term for the growth and increase of the size of muscle cells. The most common type of muscular hypertrophy occurs as a result of physical exercise such as weight lifting.
Muscular Dystrophy is the name given to a group of diseases which cause progressive weakness in the muscles due to a genetic defect.