The factor that will allow further development and cooperation between humans and robots is B. Artificial intelligence.
While all the options listed, including the Internet of Things (A), machine learning (C), and natural language processing (D), contribute to the broader field of robotics and human-robot interaction, artificial intelligence (AI) serves as the foundational technology that enables robots to learn, adapt, and interact in more sophisticated ways with humans. AI encompasses a wide range of techniques and methodologies, including machine learning and natural language processing, which enhance the capabilities of robots to understand and respond to humans effectively.