B.) Thrilling
The word "exciting" is often used to describe something that generates a feeling of enthusiasm, anticipation, or interest. In this case, the sentence suggests that there is an example of something that is exciting, but it goes on to criticize the government for trying to do the same thing to US citizens. The word "exciting" in this context is likely being used in a sarcastic or critical way, implying that while something may seem interesting or enjoyable at first, there are negative consequences or implications to consider.
The word "thrilling" is a synonym of "exciting" that can be used to convey a similar sense of excitement or adventure, but with a slightly different connotation. "Thrilling" often implies a sense of danger or risk, which may be more appropriate in this context since the sentence is suggesting that the government's actions could be harmful or concerning to US citizens. Therefore, "thrilling" is the best word to replace "exciting" in this sentence.