No, option B and C would never be converted to option D. Neither of them have any level crossing issues that could restrict capacity. It's just a matter if you want to save 500 million but disrupt a portion of princes island park.
Option C (vs option B) would be a little less disruptive to Princes island Park, but it would be more disruptive to 2nd Street. I don't think option C makes sense over option B at the same cost.
Option A is terrible and should never be considered.
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