Step 1: Concept
A flywheel is a mechanical device with a significant moment of inertia used as a storage device for rotational energy.
Step 2: Meaning
Due to its rotational inertia, it resists changes in rotational speed.
Step 3: Analysis
In engines where power is delivered in pulses, the flywheel smooths out the motion by resisting sudden fluctuations in speed.
Step 4: Conclusion
Hence, it resists the sudden increase or decrease of speed.
Final Answer: (B)