Thanks so much, Paul. I really meant to get back to you sooner.
Your explanation makes pretty good sense. I have set up "B" my Landing Page as the front page, under SETTINGS menu.
You stated, "The link to front page set in custom menu will point to B ( not A), and the url will be shown as C." Do I need to somehow set up a custom menu, to point it to "B" not "A" ? And how do I go about doing that?
Then when you say "A will be just A, you have to link to it directly, and manually." Do you simply mean having the reader click on a link to take them from the Landing Page to the Home Page? This part has been relatively easy to set up, using LANDING PAGES plugin. Or, is there some other step I'm missing?
The real problem I'm running into is when you enter in the URL for the main site, it totally bypasses the Landing page.