Reading comprehension requires distinguishing between liter...
(__) The relative pronoun "which" refers to the entire preceding clause (the fact that rain caused a flood).
(__) It can be inferred that the bridge was destroyed directly by the rain drops, not by the resulting flood.
(__) This structure is an example of a sentential relative clause, providing a comment on the whole situation.
(__) The pronoun "which" could be grammatically replaced by "that" in this specific non-restrictive context.
The correct sequence, from top to bottom, is: