Did you use MapFinder to ensure a river, or did you just re-roll until you got 4 river starts?
My thoughts:
Start A: Nope. Way north, stuck on the end of a tiny peninsula, and no visible reources: we can really only expand inland/southwards. If we were to choose it though, I'd move the Settler 1E to free up the River-Grass on the western point for a CxC'd (distance 3) 1st-ringer.
Start B: Yeah, Desert starts always look pretty bad, but irrigated Floods give 3 FPT even in Despot, and we'll have at least 4 of those, so the cap will grow at +4FPT under Despot: building a Gran might actually make growth unmanageably fast once we go to Republic! (I'd move 1NW to found, though, to get more land tiles in the initial BFC). And provided we mined everything else, we would still get around 2 FPT + 1 SPT per tile on average (under Despot). OK, still not really Settler-farm-worthy, but I would suggest that we wouldn't want to do that with our cap anyway, because shrinking it regularly will significantly reduce our commerce-output during the early phase. Also being more equatorial than the other 3 starts, we should have expansion possibilities north, west (upriver), and south (provided that Hill/Mountain-range is narrow!). Having at least 2 Incense straight off the bat is nice, too...
Start C: Actually looks quite interesting, because it's in the inner curve of a bay. Though we would have to move the Settler (1NE) off the Cow before founding, we might be able to get 3/4 of a 1st ring (i.e. 5-6 towns at distance 4-ish, Cx(x)xC) without too much trouble. Also looks like the coast trends east-west, so we should still have some good land even in the 2nd-ring towns (those that we can found before the AI-Civs beat us to all the nice sites, anyway!).
Start D: A Fish and 2 Cows (if we move the Settler 1NW)
is very tempting, but really only useful if we can share some of that bounty with another town (or lock ourselves down to pumping Settlers out of our cap; see above for my objection). And in terms of global positioning, this one's also not much better than A: compare the minimaps, there may not be much room to the north of us even for our 1st-ringers, before we hit useless Tundra.
So I think I'll be contrary and vote "C" here. Leaving
@CKS to cast the deciding vote...