Final answer:
Documents would be the most helpful resource in understanding the impact of modern technology on agricultural productivity.
Step-by-step explanation:
The most helpful resource in understanding the impact of modern technology on agricultural productivity would be Documents. Documents are likely to contain research studies, reports, and data that provide detailed information about the latest advancements in technology and their effects on agricultural productivity. For example, documents might include studies on the use of precision agriculture techniques, such as GPS and remote sensing, to optimize crop production and reduce resource wastage.