Step 1: Understanding the Concept:
This analogy question requires us to identify the relationship between the given pair of words and find an option with a parallel relationship.
Step 2: Detailed Explanation:
The relationship between AQUATIC and WATER is definitional. AQUATIC means living in, growing in, or relating to WATER.
Let's analyze the options to find the same relationship:
(A) Cumulus is a type of cloud, not a word meaning "relating to clouds."
(B) Inorganic describes substances not of living origin; elements can be inorganic, but the relationship is not as definitional.
(C) Variegated means having patches of different colors; it can describe leaves, but it doesn't mean "relating to leaves."
(D) Rural relates to the countryside, not specifically to soil.
(E) ARBOREAL means living in, growing in, or relating to TREES. This relationship is identical to the one between AQUATIC and WATER.
Step 3: Final Answer:
The relationship "X means relating to Y" holds for both "AQUATIC: WATER" and "ARBOREAL: TREES." Therefore, option (E) is the correct answer.