For Children with Duchenne Muscular Dystrophy, Pharmacotherapy Support Includes Corticosteroid

For children with Duchenne muscular dystrophy, pharmacotherapy support includes corticosteroid administration to slow the progression of muscle weakness, as well as angiotensin-converting enzyme (ACE) inhibitors and beta blockers to slow the progression of which coincident medical condition?

A) Cardiomyopathy
B) Tubular sclerosis
C) Diabetes mellitus
D) Chronic obstructive pulmonary disease