To effectively communicate multiple points in an email, it is best to use lists with bullets or numbers (option D). This formatting makes it easier for the reader to quickly scan and understand the different points being made.

Option A (include all the points in the last paragraph) is not the best choice because it may cause the reader to miss important information if they do not read the entire email.

Option B (include all the points in one paragraph) may make the email difficult to read and understand, especially if the points are complex or lengthy.

Option C (ask them to call you) is not the best choice if the points can be communicated effectively through email, and may not be feasible if the recipient is too busy or unavailable to call.

Therefore, the correct answer is:

The Answer is: D. Use lists with bullets or numbers.