A 27-year-old female presents with weakness of both hands. On examination, you note wasting and weakness of the small muscles of the hands and loss of pain and temperature sensation over the trunk and arms. Vibration sense is intact. What is the most likely diagnosis?
a) Amyotrophic lateral sclerosis (ALS)
b) Guillain-Barré syndrome
c) Charcot-Marie-Tooth disease
d) Multiple sclerosis