Identify the errors in the given sentence and choose the sentence that rectifies these errors.
My idea can be key idea for cracking difficult conflicts of extremely high level.

Correct option is D

Option (d) is the correct sentence.
· Errors in the given sentence:
· "be key idea" → should be "be a key idea" (An article is required before "key idea.")
· "of extremely high level" → should be "of an extremely high level" (Since "extremely" starts with a vowel sound, "an" is required.)
· Corrected sentence: "My idea can be a key idea for cracking difficult conflicts of an extremely high level."
· Grammatical rules involved:
· Articles: "a" is used before consonant sounds, and "an" is used before vowel sounds.
· Example:
· He is honest man. → He is an honest man.