We don't have enough information to answer this question, but i believe what you're trying to find is that the Muslim armies carried their faith west across the top of the entire continent.
Hopes this helps, if it doesn't please add information onto your question, like example, the choices you were given.
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Immediate conflicts:
... The USA had atomic weapons and the USSR did not. (The US would not share that technology with the Soviets.)
... The USSR did not assure that free and fair elections took place in Eastern Europe -- it saw to it that Soviet-aligned governments were installed there.
... Tensions over the East Germany / West Germany and East Berlin / West Berlin division of territory.
Deeper causes:
The USA was committed to capitalism and democratic institutions of government.
The USSR was committed to communism and imposed authoritarian government.
The Cold War was mostly a tension between these worldviews.
Answer:
a. In conclusion, due to the vast catalog and the fact that Stephen King is still writing, it is impossible to declare that any of Stephen King’s works as his best.
Explanation:
The conclusion paragraph is the restatement of the main argument(s) made in the essay. This means that whatever has been discussed in detail in the essay's body paragraphs, the conclusion merely sums up and restates the main point(s).
And on that note, the best start of a conclusion paragraph about Stephen King's best work will be to state that there cannot be any best work by the author as he is still actively writing novels, thereby making it possible to produce better works in the coming future too.
Thus, the correct answer is option a.
I'm 99% sure the answer is The Boston Tea Party