Final answer:
d. The slack for this activity is 2.
Step-by-step explanation:
The correct statement for the given activity in a CPM analysis is:
d. the slack for this activity is 2.
Slack is the amount of time an activity can be delayed without delaying the project. In this case, the difference between the late start time (10) and the early start time (8) is 2, which indicates that there is a slack of 2 hours for this activity.