The following sentence has been split into four segments. Identify the segment that contains an error.
They secret / decided / to leave / the town.

Correct option is A

Option (a) contains an error.
· Explanation: The phrase "They secret" is grammatically incorrect.
· The correct phrase should be "They secretly" to indicate the manner of the action "decided."
· Grammatical rule used: Adverbs of manner are used to modify verbs and often end in "-ly."
Example: He secretly planned the surprise party.