How does the organization in "edward jenner and the history of smallpox and vaccination” change at the beginning of the section labeled "edward jenner”?

At the beginning of the section labeled “Edward Jenner” progressive life events of an individual are provided in contrast with the other parts in which there is like a debate on the subsection. This part shows the facts chronologically ordered while the others are more like cause and effect.

I dont know if it right but i put A

Explanation:

It is the best option

through negative experiences we learn many things its sort of like karma if u do something bad to someone and u get a consequence u dont like the next time u wont do it again and as for positive ur not really learning anything and another example for negativity people didnt want barrack obama as president because they thought he was the worst and he was taking but now we have donald trump   and hes   is not anyone and shut down the government over sum petty stuff unlike barrack obama who shut down the government because they did not want to give health care to the community and now these people who want him out want him in now