Answer: I think Tara will write a new concerto because she is whistling Mozart.
Explanation: The selection that says Tara will tutor Leigh because Tara is a more experienced flutist doesn't make sense since she failed her piece for testing. The selection that says Tara will play outside before practicing doesn't make sense because if she failed then why would she waste her time fooling around instead of trying to get better. The selection that says that she realized her mistake and will practice for her test doesn't make sense either because why would she just now be figuring out her mistakes if her failing the test happened a month ago. That leaves us with the only logical choice Tara will write a new concerto because she is whistling Mozart. If you use text evidence then you will see that as she is whistling she lengths her strides when she sees her house. You can then go on and make an interpretation that she might write a concerto using Mozart or another artist or whatever and use that for her test piece. Hope this helps!