During an Assessment of an 80-Year-Old Patient,the Nurse Notes the Following

During an assessment of an 80-year-old patient,the nurse notes the following: inability to identify vibrations at the ankle and to identify position of big toe;slower and more deliberate gait;slightly impaired tactile sensation.All other neurologic findings are normal.The nurse knows that these findings indicate:

A) cranial nerve dysfunction.
B) lesion in the cerebral cortex.
C) normal changes due to aging.
D) demyelinization of nerves due to a lesion.