Complete

Which caused the accident is correct as a relative clause specifying the bike car’s role. This question tests relative pronoun knowledge. Caused the accident lacks a connector making it incomplete. Cause the accident uses incorrect present tense. Which introduces a clause clarifying the subject’s action. Understanding relative clauses enhances sentence structure precision. This construction is common in descriptive writing or speech. Correct usage ensures clarity in identifying subjects’ roles. Knowing which is vital for academic or professional communication ensuring sentences are grammatically complete and convey precise information about events or causes.