(单选题)

What is found by the first major study on adverse childhood experience(ACEs)？( )

A.ACEs are common across all socioeconomic groups.

B.There are some disparities for some population groups.

C.ACEs are not directly related to chronic health problems.

D.Children are more vulnerable to adverse experiences than adults.

参考答案：A

参考解析：

根据第一段A study published in JAMA Pediatrics — the largest nationally representative study to date on ACEs — confirms that these experiences are universal, yet highlights some disparities among socioeconomic groups.可知，A对，B错，错在“some population groups”指代模糊。C和D不是根据the first major study得出来的，排除。故本题正确答案选A。

知识点：细节题英语阅读理解通用英语