Arrange language units from the smallest building block to the largest coherent unit: Items: a. Word b. Paragraph c. Sentence d. Letter Choose the correct smallest-to-largest sequence.

Introduction / Context:
Language structure builds in layers. The problem assesses your understanding of how written units combine to form larger textual constructs.

Given Data / Assumptions:

• d = Letter, a = Word, c = Sentence, b = Paragraph.
• We consider the standard composition: letters→words→sentences→paragraphs.

Concept / Approach:
Identify the atomic unit (letter) and repeatedly aggregate to the next level of organization.

Step-by-Step Solution:

Verification / Alternative check:
Any other order would break the “part-of” relationship (e.g., a word cannot contain a paragraph).

Why Other Options Are Wrong:

• a,c,d,b: Puts sentence before letter; incorrect aggregation.
• Other permutations violate the natural build-up.

Common Pitfalls:
Confusing grammatical importance with structural size; here, size/containment is the criterion.

Final Answer:
d, a, c, b