Same shop, but multiple domains for AB-testing. How?

[grammer]

I have a domain A and installed prestashop there. It is already working there.

 

I bought domain B and C, with different name, but totally same content. I do not care about logo. Only domain name.

 

When user accesses from domain B, I would like the URL to stay the same — the domain B.

 

How do I modify htaccess? Right now if I access from B/some_url/, then it redirects to A/en/.

 

What I have:

RewriteEngine on
DirectoryIndex index.php index.html index.htm


Options +FollowSymLinks
RewriteBase /

RewriteCond %{HTTP_HOST} ^websiteone.com$ [NC]
RewriteCond %{REQUEST_URI} !^/websiteone/prestashop/.*$
RewriteRule ^(.*)$ /websiteone/prestashop/$1 [L]

RewriteCond %{HTTP_HOST} ^websiteone.eu$ [NC]
RewriteCond %{REQUEST_URI} !^/websiteone/prestashop/.*$
RewriteRule ^(.*)$ /websiteone/prestashop/$1 [L]

RewriteCond %{HTTP_HOST} ^websitethree.com$ [NC]
RewriteCond %{REQUEST_URI} !^/websiteone/prestashop/.*$
RewriteRule ^(.*)$ /websiteone/prestashop/$1 [L]