Don't use your client to test ideas on. How would you feel if your doctor gave you a series of options instead of a firm diagnosis. It breaks down confidence. You can ask questions or opinions, certainly, but try to keep them in the abstract. Before presenting your ideas to your client, draw them into your thinking gradually.
Shock tactics are all very well, but can spring unfortunate defence mechanisms.
Remind the client of the brief that you agreed upon. Show that you have identified the problem and drop a few hints about a possible solution or solutions that you considered, but rejected for some good reason. It may be that you want to illustrate some of these rejected ideas, that makes the case for the final solution a much stronger one. Then, having presented your solution, go on to build upon its benefits. Explain why this solution is right - and uniquely so.