Choose the sentence that correctly uses COMMAS to set off nonrestrictive elements. A. Mr. Jackson who moved here from Texas was introduced to us as the new principal.
B. Mr. Jackson who moved here from Texas, was introduced to us as the new principal.
C. Mr. Jackson, who moved here from Texas, was introduced to us as the new principal.

How does this excerpt develop the central idea that espionage during the civil war was often carried out by untrained citizens? it enhances the reader’s understanding by explaining why training was unnecessary. it changes the reader’s perception of what information a spy was able to obtain. it explains an ordinary person’s motivation for conducting espionage against the enemy. it adds moral complexity to espionage, due to the use of secret and dangerous methods.