Question

read this excerpt from the dark game. another thing that changed very little in the years between the wars was the means of obtaining military intelligence. although the use of photography and the telegraph brought some technological advances, the craft of spying on the enemys army still relied on fieldwork. in the rest of the text, how does the author develop this central idea that spying during the civil war still involved mostly fieldwork? by enhancing the readers understanding of which technological advances were used during fieldwork by changing the readers perceptions about how fieldwork could help the union cause by including more detailed information about who did fieldwork for the union and how it was done by adding complexity to the topic by raising the moral issues involved in fieldwork and other espionage

Explanation:

To develop the central idea that Civil - War spying relied on fieldwork, more details about who did fieldwork and how it was done would be effective. The other options focus on technology, perception change, or moral issues instead of directly developing the field - work central idea.

Answer:

by including more detailed information about who did fieldwork for the Union and how it was done