【正确答案】 A

【答案解析】原文：During the COVID-19 pandemic, pets have only become more important. They have added enjoyment and humor to lives lived indoors. And they keep us company. However, as more people are still working from home because of health restrictions, the animals they keep are causing new problems too. But first, let’ s talk about the good side. For many dogs, the quarantine may seem perfect. Their owners are around all the time, or as we say, 24 hours a day, 7 days a week. So, there might be more time for walks and more treats. Sleeping on the bed at night? Not a problem.题目问的是为什么大脑扫描研究受到了批评。新闻结尾提到大脑扫描研究在几个方面受到了批评。这些批评包括受试者太少和错误的解读结果。故答案为A。