The correct option is
D Take care, see you later.
The end of any conversation is signified by the involved entities parting ways. In other words, it involves the entities saying 'goodbye'. Option D is correct as 'see you later' indicates they are parting ways.
Options A and B are incorrect as they can be a general statement and do not ensure the end of the conversation.
Option C is incorrect as the person on its receiving end will either try to convince the one who said it or at least say goodbye. Thus ensuring the continuation of the conversation.
Option D is incorrect as it expresses intent to part ways and not the actual parting.
Also, Options A, B and C cannot be the answers as we are talking with our friend, and these options express a conversation ending in a formal way which is generally not used among friends. However, the last option seems to be the most appropriate one as we can use that to end a conversation with our friend.