In this error spotting question, read the sentence and identify the part that contains an error. The sentence is: "There is no one I have met or heard of whom I can consider knowledgeable than my English teacher."

Introduction / Context:
This question tests your understanding of comparative structures in English. The sentence is trying to say that nobody is more knowledgeable than the speaker English teacher. However, the comparative degree is not correctly expressed. You must decide which part of the sentence contains the error that breaks this comparison.

Given Data / Assumptions:

• Sentence: "There is no one I have met or heard of whom I can consider knowledgeable than my English teacher."
• Segments:
  • A: There is no one
  • B: I have met or heard of
  • C: Whom I can consider knowledgeable
  • D: Than my English teacher
• Option E: No error.
• The intended meaning is "no one more knowledgeable than my English teacher".

Concept / Approach:
To compare one person with another, we generally use a comparative adjective followed by "than", for example "more knowledgeable than". In the given sentence, the phrase "whom I can consider knowledgeable than my English teacher" is incomplete because it lacks the word "more" before "knowledgeable". The error lies in the segment that contains "knowledgeable". Once we correct that segment to "whom I can consider more knowledgeable", the comparison with "than my English teacher" becomes grammatical.

Step-by-Step Solution:
Step 1: Identify the comparison. The sentence says "no one ... than my English teacher", which is clearly a comparative structure. Step 2: Check where the adjective that is part of the comparison appears. It appears in segment C: "whom I can consider knowledgeable". Step 3: Realise that in standard English we should say "more knowledgeable than", not simply "knowledgeable than". Step 4: Therefore, segment C is missing the word "more" and should be corrected to "whom I can consider more knowledgeable". Step 5: The other segments A, B, and D are grammatically acceptable and need no change.

Verification / Alternative check:
Rewrite the corrected sentence: "There is no one I have met or heard of whom I can consider more knowledgeable than my English teacher." This now clearly and correctly expresses that among all people known to the speaker, the English teacher has the highest level of knowledge. If you try to change D instead, for example to "as my English teacher", you would need further adjustments such as "as knowledgeable as", not just "knowledgeable". Therefore, the most direct and necessary correction is in segment C.

Why Other Options Are Wrong:
Segment A "There is no one" is a standard way to start such a comparison.

Segment B "I have met or heard of" correctly extends the group of people the speaker knows about.

Segment D "than my English teacher" correctly introduces the point of comparison.

Choosing "No error" would leave the ungrammatical "knowledgeable than" unchanged.

Common Pitfalls:
A common mistake is to overlook missing degree words like "more" in comparisons. Students may focus only on whether "than" is present but ignore whether the adjective is in the correct form. Remember that comparative structures usually follow "more + adjective + than" for longer adjectives like "knowledgeable". Practising with patterns such as "more intelligent than", "more careful than", and "more knowledgeable than" will help you quickly spot similar errors.

Final Answer:
The error is in segment C, which should be "whom I can consider more knowledgeable", so option C is correct.