Apex domains cannot have CNAME records.
Question and response
Question
dig adamsvilleautosales.com. NS
Answer
adamsvilleautosales.com. 5 NS ns-454.awsdns-56.com.
adamsvilleautosales.com. 5 NS ns-723.awsdns-26.net.
adamsvilleautosales.com. 5 NS ns-612.awsdns-12.net.
adamsvilleautosales.com. 5 NS ns-771.awsdns-32.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0