C i think is the right answer
The Cuban Missile Crisis was the situation that led to The Bay of Pigs; it the crisis being that Soviets armed Cuba with missiles. The Bay of Pigs was a failed attempt on the US's part to invade (and reclaim) Cuba to stop the Cuban Missile Crisis.
When a researcher accidentally influences how participants behave, this effect is referred to as placebo effect
<h3>
What is placebo effect?</h3>
The placebo effect occurs when a patient receives a "dummy" treatment such as a placebo and their physical and mental health improves as a result.
In a placebo effect, the patient only reacts to the treatment because they think it is having an impact on them.
Much like when you give a youngster sugar tablets to take the edge off of their agony, they take them like medicine and feel better.
<h3>How does the placebo effect work?</h3>
Because it tricks the brain into thinking it is healing itself by releasing hormones that make you "feel good," the placebo effect is very potent. Therefore, when your doctor prescribes a placebo, they do not inform you that it has no effect; rather, they inform you that it will help you with your illness.
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<em>Basically, the Ming incorporated the Song dynasty's policy of relying on the literati in managing state affairs. However, from the Yongle emperor onward, the emperors relied increasingly on trusted eunuchs to contain the literati.</em>
<em>T</em><em>h</em><em>e</em><em> </em><em>F</em><em>i</em><em>n</em><em>a</em><em>l</em><em> </em><em>A</em><em>n</em><em>s</em><em>w</em><em>e</em><em>r</em><em> </em><em>i</em><em>s</em><em> </em><em>:</em><em> </em><em>A</em><em>.</em>
Based on the available information and records, the event that happened recently is "<u>the number of snow leopards in Sailugemsky National Park reached 15."</u>
<h3>The available events and the year of occurrence are the following:</h3>
- Mergen Markov returned home to the village of Argut - It occurred in the year 2000
- The Soviet Union collapsed and poaching began to increase in Russia - It occurred in 1991
- Sailugemsky National Park was established as a protected area for snow leopards - it occurred in 2010
- The number of snow leopards in Sailugemsky National Park reached 15 - It occurred in 2020
Hence, in this case, it is concluded that the correct answer is option D.
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