Arrange the following water bodies by increasing size/general extent. Items: (a) Ocean (b) Sea (c) Pond (d) River

Introduction / Context:
We rank common water bodies roughly by scale and hydrological role from smallest/local to largest/global.

Given Data / Assumptions:

• Pond is typically the smallest, localized standing water.
• River is larger and flowing, draining into seas/oceans.
• Sea is a large saline body, part of or connected to oceans.
• Ocean is the largest body of water on Earth.

Concept / Approach:
Use general size/extent: Pond → River → Sea → Ocean.

Step-by-Step Solution:

Verification / Alternative check:
Rivers commonly discharge into seas; seas are subdivisions/margins of oceans.

Why Other Options Are Wrong:

• They place ocean too early or mix river/sea order.

Common Pitfalls:
Confusing “river” (flowing) with “sea/ocean” (standing saline bodies).

Final Answer:
c, d, b, a