问题：

[单选]

You create a Microsoft ASP.NET application by using the Microsoft .NET Framework version 3.5. The application contains the following code segment：  
public class CapabilityEvaluator  { 
public static bool ChkScreenSize（System.Web.Mobile.MobileCapabilities cap， String arg） { int screenSize = cap.ScreenCharactersWidth * cap.ScreenCharactersHeight；  
return screenSize < int.Parse（arg）；
  } 
}   
You add the following device filter element to the Web.config file：  
<filter name="FltrScreenSize" 
  type="MyWebApp.CapabilityEvaluator，MyWebApp"   
method="ChkScreenSize" />   
You need to write a code segment to verify whether the size of the device display is less than 80 characters. 
Which code segment should you use？（）

A . A
B . B
C . C
D . D