[单选]
You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You add a ListBox to show grouped data.
The ListBox is data-bound to a collection of items. Each item has the Name and State properties.
You need to ensure that the ListBox meets the following requirements:
Names grouped by State
Names sorted in ascending order
States sorted in descending order
Which code fragment should you use?（）

A .
B .
C .
D .

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You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You add a ListBox to show grouped data.
The ListBox is data-bound to a collection of items. Each item has the Name and State properties.
You need to ensure that the ListBox meets the following requirements:
Names grouped by State
Names sorted in ascending order
States sorted in descending order
Which code fragment should you use?（）

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