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Answer: D. The activity is not on the critical path.
Explanation:
The critical path refers to the longest path from the start of a project to it's completion and it shows the minimum time that is necessary to complete the entire project.
In this case, the activity is not on the critical path as the early start time and the late start time isn't equal. Also, the difference between the late start time and early start time is 20-15 = 5 and not 0.