Which Argument(s) Present(s) the Best Case(s) for Extending the Thread

Multiple Choice

Which argument(s) present(s) the best case(s) for extending the Thread class rather than using the Runnable interface in conjunction with a thread pool?
i.Thread sub-classes will all execute independently
II.Runnable objects will waste more system resources
III.Thread sub-classes can execute faster on a single CPU than Runnable objects

A) Only I
B) Only II
C) Only III
D) II and III