(单选题)
According to the research, we can learn that ______.
A.hormonal activity helps shape facial bones
B.people are growing bodies during puberty
C.women with broad faces may be cleverer
D.motivation and behavior depend on faces
参考答案：A
参考解析：
推理判断题。根据第三段第二句“The theory is that such changes help shape facial bones... motivation and behavior”可知，such change是指上文提及的激烈的荷尔蒙活动，即荷尔蒙的变化影响面部骨骼，并有助于开发与动机和行为有关的大脑区域，因此A项正确，B项“人们在青春期长身体”和C项“脸宽的女性更聪明”文中并未提及，排除；D项“动机与行为取决于脸部”与原文不符，排除。故选A。
知识点：
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