Concept:This is a conditional sentence showing that a past action happened because the speaker lacked important knowledge.
Explanation:The sentence is structured in the third conditional form: "We would never have followed his advice if we had known his reputation."
This indicates that, in reality, we did follow his advice.
The reason we acted this way is that we did not know his reputation beforehand.
We only discovered who he truly was after the mistake had already been made.
If we had known what people said about him, we would have refused his advice.
However, since we were unaware of his real character, we accepted and acted on his counsel.
Therefore, the most suitable interpretation is that we followed his advice because we did not know him well enough.
Answer:C. followed his advice because we didn't know him.