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I would say obtain because expand means to give out, or to spread. If you obtain it, that means you keep it in one place, or to yourself.
It would be a. which is obtain because if expand means to spread, then obtain would mean to collect and when you say opposite, I think the word you should put there is antonyms because antonyms just means the opposite, but if you wanted to be more specific you should use the word antonym.
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