Which of the following best describes muscular dystrophy?

Muscular dystrophy is best described as a group of inherited diseases characterized by progressive muscle weakness. This condition involves a deterioration of muscle tissue, which is typically caused by genetic mutations affecting the proteins necessary for muscle function. As the muscles weaken over time, individuals may experience difficulties with movement, leading to significant physical challenges.

The nature of muscular dystrophy being progressive means that symptoms can worsen, and the degree of muscle weakness varies depending on the specific type of dystrophy an individual has. This description encapsulates the condition's primary characteristics, making it the most accurate choice among the options provided.

The other options are less suitable because they do not accurately capture the essence of muscular dystrophy—such as suggesting it is solely a bone condition, implying an immediate strength loss that does not characterize the gradual progression of the disease, or stating it affects motor skills without impacting muscles, which overlooks the core issue of muscle weakness that defines all forms of muscular dystrophy.