[A] Creating large-scale applications
[B] Building dynamic web pages
[C] Running scripts automatically
[D] Writing server-side code

Answer: [A] Building dynamic web pages.

Explanation: JavaScript was originally designed to build dynamic web pages, making it easier to add interactivity to websites. It has since evolved to be used for a wide variety of tasks, including creating large-scale applications and running scripts automatically. However, JavaScript was not designed for writing server-side code, as this is usually handled by other languages such as PHP, Python, or Java.