The claim that sleep is more beneficial than wakefulness to memory is made in the very last sentence of the passage. That's why B is not really correct.
You may have been referring to this part of the third last sentence in the passage: "including one (study) demonstrating that sleep stabilizes declarative memories from future interference caused by mental activity during wakefulness." This is not really saying that sleep is more beneficial to memories than wakefulness is. Instead, it is saying that sleep makes memories more stable and protects them from interference caused by mental activity. And the sentence in lines 14–16 does not explain why that previous claim is unsustainable.
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Which factor most greatly limits the power of the US government?
Answer:
A Constitutional System
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In February 1852, arrangements were ending up rare. The rancheros who had been driving meat groups into the valley and the donkey drivers who got onions, potatoes, spread and espresso couldn't get past the profound snow that secured the slopes encompassing the bars. So the Clapps and their neighbors lived for three months on flour, dull ham, salted mackerel, and corroded pork. Also, when the snow at last dissolved, spring surges started, clearing without end flume apparatus, log spans, long toms, supports, a recently completed sawmill and a few men. By mid-May, the dilutes quieted and crisp arrangements arrived. So did countless American newcomers. On May 25, Louise noted: 'Several individuals have touched base upon our Bar inside the most recent couple of days; drinking cantinas are jumping up toward each path; the fluming operations are quickly advancing, and all searches positively for an occupied and prosperous summer.' Some of these newcomers had battled in the Mexican-American War and had a tendency to see Spanish-talking individuals as foes.
After the September 11 attacks on the World Trade Center, NATO invoked Article 5 of its treaty which stated "<span>d. that allied nations must support a nation under attack," since this was one of the primary purposes of NATO when it was created during the Cold War. </span>