A timeline will usually you what caused an event unless the cause wasn't important enough to be there like a boulder fell off a cliff because it rained
i belive that the correct answer is the children swimming wer swimming in the shallow end of pool
The word <em>quickly </em>describes the verb, or the way in which the line is moving. This means that this word is an B. adverb.
A would be - is long, is moving
C would be - long
There are no prepositions here.