Historians could analyze this colonial division of Zulu lands as a reason for lasting British victory in the Zulu Wars primarily through option B: dividing the Zulu lands separated their societies and economies.
By segmenting the territories, the British effectively fragmented the Zulu nation, which would have weakened their unified resistance against British forces. This division could have undermined social cohesion, disrupted traditional alliances, and hindered coordinated military responses, all of which would contribute to British military success in the conflict.
While the other options may contain elements of truth regarding the consequences of land division, option B most directly addresses the broader implications of fragmentation on the Zulu's ability to resist British forces effectively.