Final answer:
static string echostring(string text) { 'return text;' }. The return statement in the function 'echostring' should return the parameter 'text' which is passed to it. The completed return statement would be 'return text;'. This would allow the function to echo the given string.
Step-by-step explanation:
The question relates to programming, specifically to a method that returns a string in C#. The code provided defines a method named echostring that takes a single parameter called text of type string.
The purpose of this method is to return the string that it receives as an argument. Therefore, the return statement should simply return the parameter text.
To complete the method, the return statement should be:
return text;
This would make the complete method look like this:
static string echostring(string text) {
}
The method can then be called with any string, and it will echo (return) that same string.