对某一调查对象在一个较长的时间内的特征变化进行的调查称为(  )调查。   

A、<span style="font-size: 14px; font-family: 宋体;">现状</span><span style="font-size: 14px; font-family: &#39;Times New Roman&#39;;">&nbsp; &nbsp;&nbsp;</span>

B、<span style="font-size: 14px; font-family: 宋体;">相关</span><span style="font-size: 14px; font-family: &#39;Times New Roman&#39;;">&nbsp; &nbsp;&nbsp;</span>

C、<span style="font-size: 14px; font-family: 宋体;">发展</span><span style="font-size: 14px; font-family: &#39;Times New Roman&#39;;">&nbsp; &nbsp;</span>

D、<span style="font-size: 14px; font-family: 宋体;">预测</span>