Put the boxes in order from the oldest to the most recent to show how a narrative's events flow.
after winter break
yesterday
when school started
last summer

last summer; when school started;  after winter break; yesterday

Explanation:

last summer is the first because its comes before school started;  

and during the studies there are the winter break;

yesterday is on the day preceding today.

Last summer, when school started, after winter break, yesterday, is the correct answer.

Explanation:

The order of elements seems to start today (the present) and the closest past is yesterday; a little bit farther away, there is after the winter break. Since schools start after summer, next one (still going backwards) is when school started; finally, the farthest one in time is last summer, which seems to indicate the beginning of the events.

its confident and professional

im not sure if its a or b but i think its b because of the past tense