Answer: A, B and E

E. Test.setCurrentPage(pageRef): This sets which Visualforce page the test is running on. It is the starting point for a wizard test, because ApexPages.currentPage() doesn’t exist until you set one.
B. ApexPages.currentPage().getParameters().put('input', 'TestValue'): The wizard reads a parameter from the initial URL, so the test has to supply that parameter. (The option’s text is garbled by OCR, and I’m reading it as this statement.)
A. String nextPage = controller.save().getUrl(): This calls a controller action and checks the PageReference it returns. In a wizard, the next page is the thing to assert on at each step.
apex
@isTest
private class WizardControllerTest {
@isTest
static void testWizardStep() {
PageReference pageRef = Page.WizardStep1;
Test.setCurrentPage(pageRef); // E
ApexPages.currentPage().getParameters().put('input', 'TestValue'); // B

WizardController controller = new WizardController();
controller.name = 'Test'; // simulate user input

String nextPage = controller.save().getUrl(); // A
System.assert(nextPage.contains('wizardstep2'));
}
}

The other options don’t fit:

C. insert pageRef;: A PageReference isn’t an sObject, so you can’t insert it. The statement doesn’t compile.
D. public ExtendedController(ApexPages.StandardController ctrl) {}: This is a constructor declaration for a controller extension. It belongs in the controller class, not in a test, and the question is about a custom controller, not an extension....

Correct Answer: A,B,E*