Step-by-step explanation:
Source A is useful for understanding the public opinion of the police's investigation and the potential identity of their suspect. It provides a description of a potential suspect, "Leather Apron," and gives insight into the public's belief that he is of Jewish parentage. Source B is useful for understanding the difficulties that the police are facing in their investigation. It details the number of unreliable leads that the police have been inundated with and the difficulties that have arisen from the public offering a reward for information. Overall, these sources provide useful insight into the problems encountered by the police investigating the Whitechapel murders.