Final answer:
Illegal steering in the real estate industry can occur when a licensee engages in discriminatory practices. Refraining from showing listings that aren't ADA accessible at the client's request could be considered illegal steering based on disability.
Step-by-step explanation:
Illegal steering can occur in the real estate industry when a licensee engages in discriminatory practices towards certain groups of people. In this case, option B seems to be the only one that could potentially bring a charge of illegal steering. Johnny refraining from showing listings that aren't ADA accessible at the client's request could be seen as discriminatory based on disability. This practice could limit the client's choices and perpetuate housing segregation.