To answer this question, the user needs to have a basic understanding of JavaScript and DHTML.

JavaScript is a programming language used to create interactive effects on web pages. DHTML stands for Dynamic HTML, which is a combination of HTML, CSS, and JavaScript used to create dynamic web content.

Now, let's evaluate each option to determine the correct answer:

A. JavaScript is DHTML plus CSS plus Document Object Model. This statement is incorrect as DHTML is the combination of HTML, CSS, and JavaScript. JavaScript is an integral part of DHTML, not an addition to it.

B. DHTML is Document Object Model plus JavaScript plus CSS. This statement is correct. DHTML is the combination of HTML, CSS, and JavaScript used to create dynamic web content. The Document Object Model (DOM) is a programming interface for HTML and XML documents, and it is used by JavaScript to modify the content and structure of web pages.

C. Document Object Model is JavaScript plus DHTML plus CSS. This statement is incorrect as JavaScript is a part of DHTML, not the other way around. The DOM is used by JavaScript to modify DHTML, not the other way around.

D. JavaScript has nothing to do with DHTML. This statement is incorrect. JavaScript is an essential part of DHTML and is used to create dynamic web content.

Therefore, the correct answer is:

The Answer is: B. DHTML is Document Object Model plus JavaScript plus CSS.