Language units — arrange from smallest to larger meaningful constructions: (A) Letter (B) Phrase (C) Word (D) Sentence

Introduction / Context:
Understanding basic language hierarchy is essential to verbal reasoning. We start from the smallest symbol and build toward larger, structured meaning.

Given Data / Assumptions:

• Units: Letter → Word → Phrase → Sentence.
• A phrase is a meaningful group of words but is not necessarily a complete thought; a sentence expresses a complete thought.

Concept / Approach:
Letters combine to form words. Words can form phrases (partial ideas or grammatical units). Phrases help form sentences that convey complete thoughts with subject and predicate.

Step-by-Step Solution:
1) Letter (A) → minimal symbol set.2) Word (C) → letters grouped into meaning units.3) Phrase (B) → group of words with grammatical function.4) Sentence (D) → complete thought.

Verification / Alternative check:
Grammar primers universally teach this build-up order.

Why Other Options Are Wrong:

• Putting sentence before phrase reverses composition.
• Starting at phrase or sentence omits the foundational linguistic units.

Common Pitfalls:
Confusing phrase with sentence; a phrase lacks full predication.

Final Answer:
A, C, B, D