Hello, I wonder why it says using "could" is incorrect. I suppose both "might" and "could" are possible.
By the way, I found this test on some Russian site.
We don't use can/could and able together.
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The answer must be the most commonly used collocation. Although all four answers are possible, there is one that is far more frequently used, and it is neither might (the second most likely) nor could (the least likely).