Hi there,
All imma say is GCSE grades for any subject don't always mean a lot, in regards to using them as deciding factors for whether you should do a subject at A-Level.. I got a 9 in Lit and I don't do it at A-level and a lot of people from my skl who took it, regret it and don't actually enjoy it.
Look at the specs for all of your options and then imagine studying that for 2 years. Do the units and modules actually interest you?
I do RE A-Level, and it's really fascinating, it actually goes well w/ Psych as well.