Situational irony because it's the situation.
Secrets are one of the central themes in the book, although they are not the most prominent theme, they are quite important, as the ending of the book relies heavily on an untrue fact and untrue story, or rather a secret, which determines the fate of one of the characters. This quote (above in your question) particularly mirrors the quote " You never really know a person until you consider things from his point of view...until you climb into his skin and walk around it." Boo Radley remains a secret from the beginning of the book until the end and this quote relates to him as Scout and Jem try to figure him out, since he is so mysterious, yet another one of the secrets present in the novel.
C. These early doughnuts were found in prehistoric Native American ruins.
C is the best answer. A tradition is something that has been around for a while. Option C says that doughnuts were found in prehistoric Native American ruins which means that they have been around for a long long time. Option D is not a good choice because it doesn't say anything about donuts, it's only about bread. The other options do not indicate that they have been around for a significant portion of time.
<u>Answer</u>:
The sentence that would improve this conclusion is - Organizing safety classes for drivers and cyclists will ensure that everyone knows the rules. The right option is <u>Option B.</u>
<u>Explanation</u>:
While analysing the conclusion of this excerpt, this option seems to be the best. In the end of the passage it is said that sharing the road can be tricky, but there are things that can be done. One option is given which is the organisation of safety classes for drivers and cyclists. If any country or town, opts for this then there would be less chaos on roads and seeing others people following the rules and regulations will bring about road safety and ensure the safety of drivers and cyclists.