An activity has an early start date-of the lOth and a late start date of the 19th. The activity also has a duration of 4 days. There are no nonworkdays. From the information given, （）what can be concluded about the activity?
ATotal float for the activity is 9 days.
BThe early finish date ofthe activity is the end ofthe day on the 14th.
CThe late finish date is the 25th.
DThe activity can be completed in 2 days ifthe resources devoted to it are doubled.