Final answer:
The correct option is a. The most successful reason behind settling Georgia was economic opportunity, as it attracted wealthier immigrants who established large plantations and contributed to the colony's growth.
Step-by-step explanation:
The most successful reason for settling Georgia among the three mentioned would be a) economic opportunity. While the Georgia Charter did grant religious freedom for all Protestants and had elements of philanthropy and social reform, the economic opportunities provided by the colony played a crucial role in its success.
The Trustees encouraged industry by giving each male immigrant fifty acres of land, tools, and resources, which attracted wealthier immigrants who established large plantations and contributed to the colony's growth.