题目选项分析

In a recent study published in Nature Neuroscience, a team of

scientists concluded that, since participants who took caffeine tablets in a memory test outperformed participants who took placebo tablets in that test,

In a recent study published in Nature Neuroscience, a team of scientists concluded that, since participants who took caffeine tablets in a memory test did outperform participants who took placebo tablets in that test, caffeine enhances short-term memory.