The most accurate response to the impact of television and photographs from the Vietnam War on the war effort in the United States is:
B. Support for the war decreased.
The extensive media coverage, including graphic images and reporting of the war's violence and its consequences, played a significant role in shaping public opinion. Many Americans became increasingly skeptical of the U.S. government's actions and promises regarding the war, leading to a decline in support for military involvement. This media exposure also fueled protests and demands for the U.S. to withdraw from Vietnam.