Concept:An antonym is a word opposite in meaning.
Finished means completed or brought to an end.
Solution:The opposite of finishing (ending) a project is starting it, that is,
initiated (began).
"Concluded" means ended, so it has the same meaning as
finished, not the opposite.
"Stopped" also means came to an end, and "organized" means arranged; neither is the opposite.
Key point: The stored key gave (B) concluded, which is a synonym of
finished. The question asks for the opposite, so the answer is
initiated.
Answer:Option A (initiated)