Choose the closest paraphrased version after the following sentence or the italicized part.
People were only shapes in dense, gray fog of dust and ash.（ ）
A、
The dusty air made people barely visible.
B、
The air was too polluted for people to breathe.
C、
People hardly stayed in shape in such dirty air.
D、
People were almost buried in thick dust and ash.
【正确答案】：A
【题目解析】：
句意：在灰蒙蒙、迷雾般的尘埃之中，人们只能显出身影。