Which code fragment should you use?

You use Microsoft .NET Framework 4 to create a Windows Presentation Foundation (WPF) application.
You plan to create a window that has a layout as shown in the following exhibit.
You need to define the code fragment to create the window layout.
Which code fragment should you use?

A.
<StackPanel Orientation=”Vertical” Background=”Gainsboro”>
<TextBlock Text=”Name:” />
<TextBox VerticalAlignment=”Top” />
<TextBlock Text=”Password:” />
<TextBox VerticalAlignment=”Top” />
<Button HorizontalAlignment=”Center” VerticalAlignment=”Center” Width=”100″ Content=”Submit” />
</StackPanel>

B.
<Grid Background=”Gainsboro”>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<TextBlock Text=”Name:” Grid.Row=”0″/>
<TextBox VerticalAlignment=”Top” Grid.Row=”0″ />
<TextBlock Text=”Password:” Grid.Row=”1″/>
<TextBox VerticalAlignment=”Top” Grid.Row=”1″ />
<Button HorizontalAlignment=”Center” VerticalAlignment=”Center” Width=”100″ Content=”Submit” Grid.Row=”2″/>
</Grid>

C.
<UniformGrid Rows=”3″ Columns=”1″ Background=”Gainsboro”>
<TextBlock Text=”Name:” />
<TextBox VerticalAlignment=”Top” />
<TextBlock Text=”Password:” />
<TextBox VerticalAlignment=”Top” />
<Button HorizontalAlignment=”Center” VerticalAlignment=”Center” Width=”100″ Content=”Submit” />
</UniformGrid>

D.
<UniformGrid Rows=”5″ Background=”Gainsboro”>
<TextBlock Text=”Name:” />
<TextBox VerticalAlignment=”Top” />
<TextBlock Text=”Password:” />
<TextBox VerticalAlignment=”Top” />
<Button HorizontalAlignment=”Center” VerticalAlignment=”Center” Width=”100″ Content=”Submit” />
</UniformGrid>