Identify the part containing an error; if none, choose ‘‘No error.’’ Sentence: Schools in that area which had English as a medium of instruction as the majority there spoke English.

Introduction / Context:
This sentence tests article usage with a unique attribute and overall clause completeness.

Given Data / Assumptions:

• ‘‘medium of instruction’’ refers to a unique institutional attribute in a school (generally takes the definite article).
• ‘‘as’’ introduces a reason clause and is acceptable as ‘‘because’’.

Concept / Approach:
When referencing a specific, unique institutional feature, the definite article is preferred: ‘‘the medium of instruction’’ not ‘‘a medium of instruction,’’ because each school typically has one designated medium.

Step-by-Step Solution:
Locate article before ‘‘medium’’: supplied article = ‘‘a’’.Correct to ‘‘the’’ to denote a unique, specified medium.Minimal recast: ‘‘…which had English as the medium of instruction as (because) the majority there spoke English.’’

Verification / Alternative check:
Compare: ‘‘the language of instruction,’’ ‘‘the head of department’’—unique roles take ‘‘the’’.

Why Other Options Are Wrong:

• A: Acceptable as relative-clause start.
• C: Noun phrase is fine once the article is corrected in B.
• D: ‘‘as’’ meaning ‘‘because’’ is idiomatic.

Common Pitfalls:
Overusing the indefinite article with unique institutional nouns.

Final Answer:
had English as a