In the choices above, the correct answer that corresponds to the statement is letter A, there is one right source for a certain information. It is because in doing a research, there is always a source in order for your information to be true or for it to have a support. Researches are in need to bear in mind that there are always a source for each information.
Unfairly because racism is that the answer you want
Perhaps the answer is ankle or toe. A nose is part of the face and ankle is part of foot. It could also be other parts of feet such as toes. Hope you have a nice day.