Chain-of-thought (CoT) prompting is the most effective technique for complex, multi-step reasoning tasks. By providing in-context examples that explicitly show the intermediate steps of reasoning from the problem to the solution, CoT teaches the model how to think. This process of decomposing a complex problem into a sequence of simpler, logical steps significantly improves the model's performance and robustness on arithmetic, commonsense, and symbolic reasoning challenges. It directly addresses the need to generate a coherent chain of deductions, which is essential for solving multi-step mathematical problems accurately.

A. Zero-shot prompting provides no examples of the reasoning process, making it unreliable for complex tasks that require structured, sequential thought.

B. Few-shot prompting with only final answers shows the model what to produce, but not how to reason, which is insufficient for multi-step problems.

D. Retrieval-augmented generation (RAG) is designed to supplement the model with external facts, not to improve its intrinsic step-by-step reasoning process.

1. Wei, J., Wang, X., Schuurmans, D., Bosma, M., Ichter, B., Xia, F., Chi, E., Le, Q., & Zhou, D. (2022). Chain-of-Thought Prompting Elicits Reasoning in Large Language Models. Advances in Neural Information Processing Systems, 35, 24824-24837. In Section 2, the paper introduces CoT and demonstrates its effectiveness on arithmetic reasoning benchmarks like GSM8K, showing it "improves the performance of large language models by a large margin."

2. NVIDIA Technical Blog. (2023, August 16). An Introduction to Large Language Models: Prompt Engineering and P-Tuning. The section "Advanced Prompting Techniques" explicitly describes Chain-of-Thought as a method to "guide the LLM through the reasoning process for complex queries," highlighting its suitability for such tasks.

3. Zhao, W. X., Zhou, K., Li, J., Tang, T., Wang, X., Hou, Y., Min, Y., Zhang, B., Zhang, J., Dong, Z., Du, Y., Yang, C., Chen, Y., Chen, Z., Jiang, J., Ren, R., Li, Y., Tang, X., Liu, Z., Liu, P., Nie, J.-Y., & Wen, J.-R. (2023). A Survey of Large Language Models. Section 4.2.2, "Chain-of-Thought (CoT) Prompting," states that CoT is a key technique to "enhance the reasoning ability of LLMs" by generating intermediate reasoning steps. https://doi.org/10.48550/arXiv.2303.18223