It’s hard to chance without an unweighted gpa. You can easily figure it out. 4 for A. 3 for B. Divide by # of classes.
All that said, you’ll know soon enough and you’re already playing with house money as you’ve got great acceptances. Anything else is bonus.
The UCs won’t work for you cost wise if you need aid.
If Astrophysics is what you want, and it will depend on unweighted gpa how much $$ you get, you might want to check out U of Arizona which is one of the top astrophysics schools in the country but an admission safety. Surprised but looks like they have a rowing club.
Good luck.