单选题 The electrical impulses are finally ______ back into the spots of light that make up the picture on the television screen.
【正确答案】 D
【答案解析】[解析] 在给出的选项中：reflected“反射”；cast“投射(光、影、视线等)”；conveyed “传达”；transmitted“发射，播送”。根据句意和各个选项的意思可知，正确答案是D。