Answer and explanation

Correct answer: A. You're late because your bus broke down.

  1. Step 1: Check each form: you're means 'you are' and your shows ownership.
  2. Step 2: 'You're late because your bus broke down' uses both correctly.
Answer
You're late because your bus broke down.
Why not the others: Your late because you're bus broke down.: The two forms are swapped. You're late because you're bus broke down.: The second you're should be the possessive your. Your late because your bus broke down.: The first your should be you're, meaning 'you are'.

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