Let's analyze the languages and their common uses.
(A) HTML (HyperText Markup Language): The standard markup language for creating web pages. It is not a programming language for AI/ML.
(C) CSS (Cascading Style Sheets): A style sheet language used for describing the presentation of a document written in a markup language like HTML. Not used for AI/ML.
(D) JavaScript: A high-level programming language that is one of the core technologies of the World Wide Web, used for making web pages interactive. While there are some ML libraries for it, it is not the most common choice.
(B) Python: This high-level, general-purpose programming language has become the de facto standard for Artificial Intelligence (AI) and Machine Learning (ML). This is due to its simple syntax, extensive libraries (like TensorFlow, PyTorch, scikit-learn), and strong community support.
Therefore, Python is the most commonly used language for AI and ML.