Final answer:
HTML is the language Murray would use to add text and multimedia content to a website, as it is the foundational technology for creating web pages.
Step-by-step explanation:
Murray is creating a new website to showcase the products his company produces. To add text and multimedia content to his website, the language he would use is HTML (Hypertext Markup Language). HTML is the standard markup language for creating web pages and web applications. With HTML, Murray can structure his web page and place his multimedia content where it needs to be. While CSS (Cascading Style Sheets) would help him style the website, and JavaScript would allow for interactive elements, HTML is the foundation that allows for the addition of text and multimedia content. PHP could be used for server-side scripting, and XML is for data representation, but these do not serve the primary purpose of adding and structuring content on the web page.