Apex domains cannot have CNAME records.
Question and response
Question
dig autodata.com.br. NS
Answer
autodata.com.br. 5 NS ns-852.awsdns-42.net.
autodata.com.br. 5 NS ns-1663.awsdns-15.co.uk.
autodata.com.br. 5 NS ns-222.awsdns-27.com.
autodata.com.br. 5 NS ns-1144.awsdns-15.org.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0