Alex Is 53 Years Old and Has Had Weakness in His

Multiple Choice

Alex is 53 years old and has had weakness in his throat and chest for a few months.Now,he is also starting to have general weakness in his arms and legs.The weakness in his legs has gotten so bad that yesterday he fell down when walking across his living room.Alex appears to be showing early signs of:

A) Parkinson disease.
B) amyotrophic lateral sclerosis (Lou Gehrig's disease) .
C) Huntington disease.
D) Alzheimer disease.