Final answer:
Capacitors can be used to smooth alternator AC ripple and prevent electromagnetic interference (EMI).
Step-by-step explanation:
The correct answer is c) Capacitors. Capacitors can be used to smooth alternator AC ripple and prevent electromagnetic interference (EMI). AC ripple refers to the small fluctuations or ripples that can occur in the output of an alternator. These ripples can cause power fluctuations and interfere with the performance of electronic devices. Capacitors can store and release electrical energy, helping to smooth out these fluctuations and reduce EMI.