Select the correct answer. Read the text below. Use the context to decide the meaning of the word exposure.

Research has demonstrated the usefulness of monitoring when assessing people's exposure to lead in the environment.

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.