Take a look, again, at my original post, which tells you how to do this, without macros.
No empty paragraph is needed or desirable. Generally speaking, empty paragraphs are a bad thing.
2.2 Why you should press Enter only once to end a paragraph
Instead, you can use larger spacing-after paragraph formatting as part of the style for that last answer.
See the macro-free document "Question Styles" on my
downloads page.