Suppose a 5 MHz acoustic pulse travels from a transducer through a layer of fat (a=0.63dM/cm/MHz), then encounters a completely reflective interface at normal incidence. Given that the smallest pressure the ultrasound system can detect is -60 dB of the emitted ultrasound wave. Find the maximum imaging depth to detect the interface. A. 9.5 cm B. 19 cm C. 47.5 cm D. 23 cm E. 4.5 cm