Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions. Now, listen to the passage. Why had there been no calls from the Nelsons for quite some time
A．Mrs. Nelson’s appendix had been taken out two years before. B．Mr. Nelson had divorced his wife and had married another woman. C．Mr. Nelson had decided not to bother the doctor any more. D．Mr. Nelson’s former wife had been very well recently.