My urgent question, is tenoption.com a scam or safe broker? also if they can trade USA customers?
TenOption is not licensed or regulated in the United States. The only binary options exchange in America that is licensed by the CFTC is Nadex.com.
There are many binary options brokers from offshore locations who try to give the impression that they are licensed, but in fact they are not.
You should look at the best brokers listed here, to see which brokers real investors are using.