A Bat Is Flying Toward a Cave Wall At $27.0 \mathrm{~m} / \mathrm{s}$

A bat is flying toward a cave wall at $27.0 \mathrm{~m} / \mathrm{s}$ . What is the frequency of the reflected sound that it hears, assuming it emits sound at $52.0 \mathrm{kHz}$ ? The speed of sound is $341.5 \mathrm{~m} / \mathrm{s}$ .

A) $61.3 \mathrm{kHz}$
B) $56.1 \mathrm{kHz}$
C) $56.5 \mathrm{kHz}$
D) $60.9 \mathrm{kHz}$