[QA] I……. the garden. No sooner had I finished watering it than it came down torrents.

Question:

I……. the garden. No sooner had I finished watering it than it came down in torrents.

• A.
  shouldn’t have watered
• B.
  mustn’t have watered
• C.
  can’t have watered
• D.
  needn’t have watered