The put and call have the same extrinsic value. You're long the call and short the put so the extrinsic val cancels which results in D1/shares.
Ok but what about the fact that the stock doesn't have extrinsic value at all, so if the price drops $2, the long call will not lose $2, and the short put will not lose $2....ohhhhhhhhhhhhhhhhhhhhhhhhhhhhh...wait...processing....the long call will lose <$2 because of extrinsic value, and the short put will lose <$2 because of extrinsic value...so they will be equal...and the stock will lose $2....
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