A Doppler exam is performed with a 5 MHz transducer. The maximum Doppler shift is measured at 2.5 kHz. If the identical exam is performed with a 2.5 MHz transducer, what maximum Doppler shift will be measured?
A. 4 kHz
B. 2.5 kHz
C. 5 kHz
D. 1.25 kHz
E. 8 kH