Answer:
C.
Step-by-step explanation:
The event missing from the 'Timeline of Georgia' in the given image is "Georgia becoming a royal colony in 1752."
A royal colony is a colony directly ruled by the king or the queen.
The Trustee period in Georgia ended when the Trustees gave control of Georgia to King George II in 1752; which meant that the colony of Georgia will now be ruled by the Crown of England.
Therefore, option C is the correct answer.