Final answer:
The correct answer is b. requires extra caution because they are legally blind, indicating that pedestrians using a white cane are visually impaired and should be given extra consideration for their safety. Sidewalk ramps and Braille signs are required by the ADA and are forms of accessibility for people with disabilities.
Step-by-step explanation:
The question posed by the student is related to pedestrian safety and the use of a white cane, which indicates that the individual is visually impaired. So, for the initial question, the correct answer is b. requires extra caution because they are legally blind. Pedestrians who are legally blind may use a white cane as a tool for independent navigation, and this signals to drivers and other pedestrians that they should exercise extra caution to ensure the safety of the individual.
Regarding the reference information provided, the correct response is d. both b and c, meaning both accommodations required by the Americans with Disabilities Act and forms of accessibility for people with disabilities. Sidewalk ramps and Braille signs are indeed accommodations aimed at ensuring accessibility for individuals with disabilities, as per the requirements set by the ADA.