In CFA analysis must be a theory in order to test it. As I see from your path diagram there are
Direct paths A1-->B, A2-->B, A3-->B and A1-->C, A2-->C, B-->C.
Indirect paths A1-->B-->C, A2-->B-->C.
Furthermorelook and in the following link. I believe it is very helpful.
http://www3.nd.edu/~rwilliam/stats2/l62.pdf