Given the peptide fragments: A-B-C, C-D-E, E-F-G, and G-H-I, what is the original sequence?

A-B-C-D-E-F-G-H-I

A-B-C-E-D-F-G-H-I

A-C-B-D-E-F-G-H-I

A-B-C-D-E-G-F-H-I