The Bantu migration significantly transformed Africa's cultural landscape by introducing new technologies, languages, and agricultural practices. Among the options provided, the most accurate impact is: **The Bantu brought knowledge of iron tools and weapons.**
This migration facilitated the spread of ironworking techniques which allowed for more efficient farming and hunting practices, ultimately leading to population growth and the establishment of various communities across sub-Saharan Africa. Additionally, the Bantu migrations led to the diffusion of languages and cultural practices, fostering a rich tapestry of diverse yet interconnected cultures.