The correct answer is: B. People say he is very rich.
The sentence “He is said to be very rich” is in the passive voice. In the passive voice, the subject of the sentence is acted upon by the verb. In this case, the subject is “he” and the verb is “said to be very rich.” The passive voice is often used when the identity of the person or thing doing the action is not important or when the focus is on the action itself.
In this case, the focus is on the fact that “he” is said to be very rich. It is not important who is saying it, only that it is being said. The passive voice can also be used to make a sentence more formal or to avoid assigning blame.
The other options are incorrect because they are in the active voice. In the active voice, the subject of the sentence is doing the action. In these cases, the subjects are “he” and “people.” The active voice is often used when the identity of the person or thing doing the action is important.
In these cases, the identity of the person or thing doing the action is not important. The focus is on the fact that “he” is very rich or that “people” say he is very rich.