Refer to the TestCircle.java file, listing $9\mathrm{.}1$ in section $9\mathrm{.}3.$

$*$Notice that this program defines the class Circle and also includes a main. This is ok$,$ just a little different from how I presented the separation of class definition and execution of a class in two separate java files.

What would happen if line $10$ where replaced with Circle circle$2=$ new Circle$("$hello$")$;

A$.$

The program would produce a compile error indicating that there is not a constructor that is able to receive a parameter of type String.

B$.$

The program would construct a Circle object with radius set to "hello".

C$.$

The program would compile, but not run.