The option that is NOT OK is:
Dividing up the assignment with a friend.
Since the assignment is to be completed individually, collaborating with a friend in this way would violate the assignment's guidelines on individual work. The other options, such as clarifying expectations, proofreading, and seeking help from a tutoring center, can generally be acceptable as they do not involve directly collaborating on the assignment itself. However, be sure to check your course's specific policies regarding collaboration and seek clarification from your professor if unsure.