I know I also opt for the plains hill normally,
But I just played this though with option A and C
And A came out on top
Because the difficulty is Prince, we Settling on C gives a health of 3, happy of 5
So the health is a huge limiting factor.
My start on A consisted of this:
Settling in place
worker==>warrior==>library
wheel==>pottery==>writing
when the worker came out he put a road on the rice while waiting for pottery to finish (2 turns...the timing was really nice)
From here growing was easy as the health was at 5, same with happy.
As for site B, unless there are 2 fish or 2 clams I suggest don't go north because the cottages on the plains hills are far more valuable in the long run.
Not to mention if we settle in place there are 3 plains hill which we can mine for production at the capital.
Final thought: This is a sirian made map, he is tempting us to move to a plains hill, when odds are there is something nice on one of those hills