because you don't need capital letter in that quiz, at second of operator-overloading of C#.
when you look at the previous lesson right before quiz and saw Box there and you think you need to fill Box in the quiz, you didn't understand that lesson.
the answers are bool, >, return
The question is asking you to overload the greater than operator, so the second space is > instead of +
same logic, the > doesn't return a Box. instead > compares two Box and return true or false, so in the first space, you should fill in the type bool, which stands for a Boolean type in C#.