Concept:A gearing factor is a reason that encouraged the Great Trek, not a concern raised against it.
Explanation:The Boers left the Cape mainly to escape British control and to regain independence.
Option A, freedom from British domination, was a clear motivating factor.
Option B, restoring economic, cultural and political independence, also encouraged the trek.
Option D, fear of conflict on the eastern frontier, pushed many Boers to move inland.
Option C, the fear that emigration might decline civilization, was an argument used by opponents of the trek.
The Dutch Reformed Church, for example, saw the trek as an act of godlessness and warned against it.
Therefore, C is not a gearing factor towards the Great Trek.
Answer:C. The panic that emigration might decline civilization