LogFAQs > #986785059

I'd aim to have as few civilian casualties as possible, so option B.

Realistically, it wouldn't be an even trade like that though. It would more likely come down to some kind of scorched earth plan that doesn't put your soldiers at risk at all (like dropping a nuke), or a more direct attack that causes less civilian causalities, but means you're soldiers have to be on the front lines and risk death.