✅ The analogy "RAIN : FLOOD" establishes a cause-and-effect relationship where rain (cause) can directly lead to a flood (effect).

Similarly, a drought (cause), which is a prolonged period of abnormally low rainfall, can lead to widespread crop failure and severe water shortages.

This scarcity of food and water often results in a famine, a severe and widespread shortage of food leading to starvation and death, making FAMINE the most fitting and direct parallel effect.

❌ DESERT is an environment type that can be exacerbated by drought, but it is not an immediate, direct consequence or disaster in the same way a flood is to rain.

❌ THIRST is an individual physiological symptom of lack of water, not a large-scale societal or environmental disaster comparable to a flood.

❌ CLOUD is a meteorological phenomenon related to weather and rain, but it is neither a cause nor an effect of drought in this context.

✅ The analogy establishes a cause-and-effect relationship where "EFFORT" is the cause and "RESULT" is its effect; putting in effort leads to a result.

✅ Similarly, "TRAINING" is a cause, and its primary direct effect or desired outcome is "FITNESS".

❌ Sweat is a byproduct or a temporary physiological response to training, not its ultimate effect or result.

❌ Coach is a person who guides training, not an effect of it.

❌ Gym is a location or facility where training occurs, not the outcome of the training itself.

✅ The original analogy RAIN : FLOOD demonstrates a cause-and-effect relationship where rain can cause a flood.

✅ Similarly, in option A, a SPARK can cause a FIRE, mirroring this exact cause-and-effect link.

❌ Option B, THIRST : WATER, presents a problem and its solution or relief, not a direct cause-and-effect in the same manner as the original pair.

❌ Option C, BOOK : PAGE, illustrates a whole-to-part relationship (a page is part of a book).

❌ Option D, SICK : HEALTHY, shows a pair of antonyms or opposite states.