Further Investigation on My SRP

Hey everyone. Its Thursday afternoon, and I'm thinking on ideas for my SRP. I've kind of abandoned the idea of doing plant related research. However, I've come up with some other ideas e.g.
 
- Do all brands of orange juice contain the same amount of absorbic acid?
- How does the sugar concentration vary in different brands of Apple Juices?
- Do different types of orange juice contain different types of Vitamin C?

AS you can see, all 3 ideas relate to liquid/juices. I might be doing ideas 1 OR 2. I'm not sure yet, as I have not thought of a method for my experiment yet.

Ms Zhang, if you're reading this, are these ideas too easy? do they meet with high school standards?

Going to finalise my decision and update soon. !