To answer this question, you need to have an understanding of WMLScript and its supported file extensions.
WMLScript is a scripting language used in WML (Wireless Markup Language) to add interactivity and dynamic behavior to mobile web applications.
The supported file extension for WMLScript is B) .wmls. This extension is used to denote files that contain WMLScript code.
Let's go through each option to understand why it is correct or incorrect:
Option A) .wmlscript - This option is incorrect because .wmlscript is not a supported file extension for WMLScript.
Option B) .wmls - This option is correct because .wmls is the supported file extension for WMLScript.
Option C) .wml - This option is incorrect because .wml is the file extension for WML (Wireless Markup Language) files, not WMLScript.
Option D) .wap - This option is incorrect because .wap is not a supported file extension for WMLScript.
The correct answer is B) .wmls. This option is correct because .wmls is the supported file extension for WMLScript files.