Answer:
"One theory suggested that the colonists made an attempt to return to England on their own."
Step-by-step explanation:
he passage mentions that officials conducted a search to determine the fate of the colonists, but it did not turn up any answers. This indicates that there is no evidence or indication that the colonists successfully returned to England on their own. Additionally, the passage states that the colony is still considered a mystery, and there is no evidence defining what happened to the colony.
Therefore, without any evidence or indication of the colonists' successful return to England, this theory appears to be the least likely among the suggested options.