Dictionary order (Aqua- family): Arrange Aquarium, Aquatic, Aqueous, Aquiline in alphabetical order.

Introduction / Context:
All four words share “aqu…”. We must sort alphabetically by continuing letter-by-letter comparison.

Given Data / Assumptions:

• Words: Aquarium, Aquatic, Aqueous, Aquiline.

Concept / Approach:
After “aqu…”, compare next sequences: “a r…”, “a t…”, “e…”, “i…”. Alphabetically: a < e < i; within “a…”, “aquarium” (“ar…”) precedes “aquatic” (“at…”).

Step-by-Step Solution:
1) Aquarium (aqu + ar…)2) Aquatic (aqu + at…)3) Aqueous (aqu + e…)4) Aquiline (aqu + i…)

Verification / Alternative check:
Dictionary lookup or string sort confirms this order.

Why Other Options Are Wrong:
They reverse the “ar/at” pair or place “e/i” words too early.

Common Pitfalls:
Assuming all “aqu…a…” precede “aqu…e…/i…” without checking the next letters in detail.

Final Answer:
Aquarium, Aquatic, Aqueous, Aquiline