C and D are wrong due to the fact that it does not occur in July and there is no direct sunlight. Also thing it’s B or A but I’m thinking its A due to the fact it doesn’t always occur on the 21st but also the 20th.
The majority of the border follows the Rio Grande River.
1,994 miles from Standish, Michigan to Arizona. Google it is my advice because here probably isn't Standish, Michigan. Here at the current moment for me is though. I can google it if you tell me where.