I ________ you if I hadn't thought it was important.
-
will not tell
-
wouldn't have told
-
wouldn't had told
-
would not tell
B
Correct answer
Explanation
Third conditional structure: If + hadn't thought (past perfect), ... wouldn't + have + past participle. 'Wouldn't have told' (B) is grammatically correct. Options A, C, and D use incorrect verb forms for this conditional type.