Question

you need to use extra caution when driving near a pedestrian using a white cane because: he or she is deaf he or she has a mental disability he or she is blind he or she has a walking problem

Explanation:

A white cane is a mobility aid used by visually impaired (blind or with low vision) individuals. Deaf people use different aids (like hearing aids or sign language), mental disability doesn't relate to white canes, and walking problems are addressed by other aids (like walkers). So the correct reason is the pedestrian is blind.

Answer:

He or she is blind