A part of the sentence may or may not have error. Find out which part has an error and mark that part as your answer. If there are no errors, mark 'No error' as your answer.  Were she my (A)/ class teacher, I (B)/ would have never missed my classes.(C)/No Error(D)?

Option 3 : C

The given sentence is a type 2 condition. The error lies in part (C), use "would never miss" instead of "would have never missed".

This statement is of type 2 conditional which refers to a hypothetical situation and its probable result.
In such a case, we use (modal - should/could/would... +verb) in the main clause and the simple past tense in plural form in the subordinate clause (hypothetical part/ if clause).

How to identify TYPE 2 conditional sentences? 

Handy tip – Statement shows a hypothetical /unlikely situation and it’s probable results. It’s not the actual situation.
Structure – subordinate clause(hypothetical part/ if clause) –  Simple past (plural)
The main clause – should/could/would.... +verb1
EXAMPLES -
1)  Were I a bird, I would have flown in the sky. ❌
     Were I a bird, I would fly in the sky. ✔️
2) If I were you, I had bought that bungalow. ❌
    If I were you, I would buy that bungalow. ✔️
3) If I had a lot of money, I will stay in five-star hotels. ❌
    If I had a lot of money, I would stay in five-star hotels. ✔️

CORRECT STATEMENT- Were she, my class teacher, I would never miss my classes