A PC is powered on and begins POST. The PC takes a long time when scanning for drives. The BIOS reports no hard drive can be found but the CD-ROM is identified. The technician knows that there are two hard drives on the primary EIDE controller and a CD-ROM on the secondary EIDE controller. Which of the following is the MOST likely cause of the problem?（）

• A、Both hard drives have the master jumper in place.
• B、One hard drive is set as master and the other slave.
• C、The hard drive data cable is reversed.
• D、Both hard drives have the cable select jumper in place.