I think it is A) Reference
A dependent clause can be used as an adjective when it qualifies a noun or a pronoun or as an adverb when it qualifies another adverb, a verb, or an adjective.
while a dependent clause cannot stand alone as a sentence (unlike an independent clause) because of the presence of a subordinating conjunction, it may serve as either an adjective or an adverb.
Example- Ben is willing to try anything that will improve his condition.
that will improve his condition (adjective: qualifies "anything")
To learn more about dependent and independent clause from the given link
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Answer:
<h2>
Your sentence is correct.
</h2>
It means 'They did not do what I asked them to do.
I think the answer to this question is that it paved way to the popularity of mystery fiction. Also, a significant result of Doyle's detective mysteries is their focus on crime investigation and paying attention to details that would help in crime-fighting - which encouraged awareness during his time about it.