Concept:
Frequency deviation is the maximum shift from carrier frequency in FM.
Step 1: Standard FM broadcasting
Commercial FM uses wideband FM.
Step 2: Standard value
Maximum frequency deviation is fixed by regulations.
Step 3: Known standard
\[
\Delta f_{max} = 75\,kHz
\]
Step 4: Importance
Ensures proper bandwidth and avoids interference.
Step 5: Conclusion
\[
\boxed{75\,kHz}
\]
Final Answer:
\[
\boxed{(D)}
\]