Error Spotting – Choose the part (A–D) that contains a grammatical error, or choose No error if the sentence is fully correct. Sentence (parts correspond to options below): A) The man B) is C) a D) social animal.

Introduction / Context:
This sentence checks basic sentence structure, article usage, and predicate nominatives. It is a simple subject–linking verb–complement construction that is standard and idiomatic in English.

Given Data / Assumptions:

• Subject: The man
• Linking verb: is
• Article and complement: a social animal

Concept / Approach:
In English, the pattern subject + be + noun phrase is common to classify or define a subject. The article a is used with a singular countable noun when making a generic classification. The complement social animal is a noun phrase functioning as a subject complement.

Step-by-Step Solution:

Verification / Alternative check:
Paraphrase: A man is a social animal or Humans are social animals. Both are standard and grammatical, confirming correctness of the original structure.

Why Other Options Are Wrong:
They are not wrong. Each fragment contributes correctly to a well-formed sentence: subject (A), verb (B), article (C), and complement (D).

Common Pitfalls:
Learners sometimes remove the article a, but that would create an ungrammatical or awkward classification. They may also attempt plural agreement incorrectly. Neither issue applies here.

Final Answer:
No error.