Final answer:
The content in the 'bootstrap' module of a loader is JavaScript (A), as Bootstrap is a framework consisting of HTML, CSS, and JavaScript for designing responsive websites and web applications.
Step-by-step explanation:
The question refers to the content found within the module called 'bootstrap' of a loader in a programming or scripting context. The correct answer to the question '______ is in the module of loader 'bootstrap'' is A) JavaScript. Bootstrap is a popular front-end framework that is used for designing websites and web applications. It includes HTML, CSS, and JavaScript components for typography, forms, buttons, navigation, and other interface components, along with optional JavaScript extensions.
The bootstrap loader in computing is typically associated with initializing the system, in which the term 'bootstrap' itself refers to the process of starting up a computer. However, in the context of web development, 'bootstrap' usually refers to the Bootstrap framework, which is predominantly based on JavaScript to provide dynamic features and responsive design. As such, it would not directly pertain to Python, C++, or Java, which are generally used in other contexts such as back-end development, systems programming, and general-purpose applications, respectively.