Answer:
A.
Step-by-step explanation:
"Americans mark 18th anniversary of Sept. 11 with tears, politics and remembrance" is an article published on Sept. 11, 2019.
The article was written as America observed the 18th anniversary of the terrorist attack on the World Trade Centre, the Pentagon, and the field in Pennsylvania on September 11, 2001, by Al Qaeda.
The central idea of the article was to share an account of how people who the bereaved ones came to pay tribute to them with tears and how political people, even on such a hard day, did not miss a chance to belittle their opponents.
The detail that is important in the development of the central idea of the article is option A. The details in the statement develop that how a generation who were infants and lost the loved ones also came to pay the tribute.
Therefore, option A is correct.