----_____he dropped out of school?

----His family has run into financial difficulties.

A．Why was it that

B．Why was that

C．Why was that it

D．Why was it

建设项目的环境影响报告书，必须对建设项目产生的污染和对环境的影响作出评价，规定防治措施，经项目主管部门预审并依照规定的程序报环境保护行政主管部门批准。环境影响报告书经批准后，计划部门方可批准建设项目设计任务书。 ( )