The correct answer is: B. Total float and independent float.
Interfering float is the difference between the total float of an activity and the independent float of an activity on which it depends. It is the amount of time that an activity can be delayed without delaying the early start of any successor activities.
Total float is the amount of time that an activity can be delayed without delaying the project completion date. It is calculated as the difference between the project’s latest finish date and the activity’s early finish date.
Independent float is the amount of time that an activity can be delayed without delaying the early start of any successor activities. It is calculated as the difference between the activity’s early finish date and the early start date of its successor activities.
For example, consider the following project network diagram:
The total float of activity A is 10 days, the independent float of activity A is 5 days, and the interfering float of activity A is 5 days. This is because activity A can be delayed by up to 10 days without delaying the project completion date, but it can only be delayed by up to 5 days without delaying the early start of activity B.
I hope this explanation is helpful. Let me know if you have any other questions.