It is svio because the other ones are wrong
C....................................................
Ok, so you know that the number will be 7 tens more, or 70 more, then the given number, 624. In order to find your new number, you will add 624, and 70, together, hopefully getting 694. And that will be your new number.
He fell for a trap that he did not see coming like like how he did not know that zeus gave a a kind of tea .