The correct answer is: C. stopped
The word “curtailed” means “to make something shorter or less in amount or extent.” The word “requested” means “to ask for something in a polite way.” The word “stopped” means “to prevent something from happening or continuing.” The word “warned” means “to tell someone that something dangerous or unpleasant is likely to happen.” The word “forbidden” means “not allowed.”
In this case, the man has stopped people from visiting him at his house because he fears it will cause discomfort to his neighbors. This means that he has taken action to prevent people from visiting him, which is the definition of the word “stopped.”
The other options are not correct because they do not accurately describe what the man has done. The man has not made visiting him shorter or less in amount or extent, he has not asked people to visit him, he has not told people that visiting him is likely to be dangerous or unpleasant, and he has not made it illegal for people to visit him.