The idiom is lend me a hand
The simple subject of this sentence is B. discovery.
Which is just an interrogative pronoun, it cannot be a subject. Important is an adjective, which cannot be a subject. You is an objective pronoun.
Answer: The answer would be B;The stories always provide accurate historical facts.
Explanation: The reason that the answer is B is because considering the genre "Historical Fiction" has the word "History" in it, that refers to the past and "Fiction" means fake. It's basically saying that the story and events are completely true, but the people in the events and possibly even the times in the story are either fake or completely changed.
