Step 1: Understanding the Concept:
A natural disaster is a major adverse event resulting from natural processes of the Earth. The question asks to identify examples of natural disasters from the given list.
Step 2: Detailed Explanation:
(A) Flood: An overflow of a large amount of water beyond its normal limits, especially over what is normally dry land. It is a natural disaster.
(B) Earthquake: A sudden violent shaking of the ground, typically causing great destruction, as a result of movements within the earth's crust or volcanic action. It is a natural disaster.
(C) Cyclone: A large-scale air mass that rotates around a strong center of low atmospheric pressure. It is a severe weather event and a natural disaster.
(D) All of these: Since floods, earthquakes, and cyclones are all examples of natural disasters, this option is the correct one.
Step 3: Final Answer:
All the given options are well-known examples of natural disasters. Therefore, "All of these" is the correct answer.