Polymer basics: Choose the correct statement(s) describing monomers, polymers, macro-molecules, and polymeric materials.

Introduction / Context:
Polymer terminology is foundational for engineers choosing plastics, rubbers, and resins. Knowing what a monomer is and how it forms long chains clarifies why polymers behave differently from metals and ceramics in thermal and mechanical contexts.

Given Data / Assumptions:

• Common definitions from materials science are applied.
• Examples: ethylene (monomer) to polyethylene (polymer).
• Focus on structural concepts rather than processing details.

Concept / Approach:
A monomer is a small molecule capable of polymerization. Polymerization links many monomers into long chains called macro-molecules. Bulk polymeric materials contain vast ensembles of these long chains, which tangle, crystallize partially, and determine properties such as toughness and creep.

Step-by-Step Solution:
Option A: Correct — monomer is the basic repeating unit precursor.Option B: Correct — polymers contain many repeating units; degrees of polymerization can be in the hundreds to thousands (or more).Option C: Correct — a single very large polymer chain is a macro-molecule.Option D: Correct — a polymeric material is a bulk aggregation of such chains.Therefore E (“All of the above”) is true.

Verification / Alternative check:
Introductory texts consistently define polymers with these terms and relationships.

Why Other Options Are Wrong:
Any single statement alone is incomplete; together they present the full picture.

Common Pitfalls:
Assuming all polymers have identical chain lengths; distributions matter (polydispersity).

Final Answer:
All of the above.