Events on a timeline must be arranged

alphabetically.

chronologically.

randomly.

briefly.

The answer would be B) chronologically. Since it's a time line you want it to be in historical order

Chronologically

Explanation:

Time lines are something that is made to be neat, it shows the events that could have lead up to something important. Chronologically means "in a way that follows the order in which events or records occurred." Basically saying in order.