The correct answer is A.
Earlier in the chapter, Woolf writes: It was disappointing not to have brought back in the evening some important statement, some authentic <span>fact.
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Thus, she wants facts to back up her claim.
By citing a historian, Woolf is making it clear that she is basing her argument on facts. Otherwise, one might claim she is exaggerating or making up stories. Instead, she is saying that such customs were fact and considered commonplace by both "high as well as low."
Success is the abstract word. It is not an object.
I phoned him because he was not home.
The second part of the sentence is now dependent on the first as it cannot stand alone as its own sentence.