Answer:
A sudden hush fell on the crowd as Mr. Summers cleared his throat and looked at the list.
Explanation:
The phrase from the excerpt that best reveals how the social environment shifts as the lottery begins is "A sudden hush fell on the crowd as Mr. Summers cleared his throat and looked at the list.".
This is because, by mentioning that there was a sudden silence in the crowd as the lottery numbers were about to be called shows that the social environment shifted as the announcement was about to be made.
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.