Meaningful learning refers to the process of acquiring new knowledge, skills, or understanding in a way that is personally relevant and applicable to real-life situations. It involves the active engagement of students in the learning process, fostering critical thinking, problem-solving, and the development of higher-order cognitive skills. In order for meaningful learning to take place, certain conditions need to be met. Let's analyze each option to understand why option D is the correct answer.

a) Students would feel free to express their viewpoints on the issues being discussed
- This condition is actually conducive to meaningful learning. When students are encouraged to express their viewpoints, it promotes critical thinking, active participation, and the exploration of different perspectives. This helps in deeper understanding and constructing knowledge together.

b) Previous experience of each student relate to the activity
- This condition is also favorable for meaningful learning. When students can relate their previous experiences to the current activity or topic, it helps in making connections, building on prior knowledge, and applying concepts in real-life situations. This enhances understanding and promotes meaningful learning.

c) Students learn in a congenial environment in the classroom
- Learning in a congenial environment is essential for meaningful learning. When students feel comfortable, respected, and supported in the classroom, they are more likely to actively participate, take risks, and engage in meaningful discussions. This fosters a positive learning environment and promotes meaningful learning.

d) Only latest issues are discussed in the classroom
- This is the correct answer. When only the latest issues are discussed in the classroom, it limits the scope of learning and may prevent students from gaining a holistic understanding of a topic. Meaningful learning requires a broader perspective, allowing students to explore different aspects, historical context, and diverse viewpoints. By restricting the discussion to only the latest issues, students may miss out on the opportunity to develop a comprehensive understanding and critically analyze the topic.

In conclusion, meaningful learning requires an environment where students feel free to express their viewpoints, can relate their experiences to the activity, and learn in a congenial classroom. However, restricting the discussion to only the latest issues can hinder meaningful learning as it limits the depth and breadth of understanding.