Final answer:
The Georgia colony returned from the Trustees' control to royal control due to economic instability and financial mismanagement.
Step-by-step explanation:
By the early 1750s, the Trustees' control over the Georgia colony was collapsing. The colony faced economic instability and financial mismanagement, as well as a withdrawal of financial support from the British Parliament. In 1752, the Georgia Trustee system collapsed, and the colony fell under royal control. Therefore, the correct option is A: Economic instability and financial mismanagement.