We need the article in order to answer your question
Answer: A.
The first paragraph explains how the system functions, and the second paragraph describes how the system has succeeded.
Explanation: A because just took the question.
A triangles angle will always be the same so it's 180 degrees.
If this is an excerpt from a story, I wouldn’t be of much help. But from a layman's perspective, it seems like the character is attempting to please the failed humorist or he or she would have been frank. This in turn may have triggered a chain reaction, prompting the humorist to continue with his jokes which would have further affected the character. He or she is also giving the former a false sense of happiness and appreciation.
This passage may not affect the whole story in a remarkably discernible manner, but it definitely proves the character's penchant for politeness. And that may be be a deciding factor in his or her further decisions that ultimately define the plot of the story.
