There is no agreement (1)/ between you and I (2)/ so we are free to go our way. (3)/ No error (4)

Answer

2

Explanation

between (Prep.) should be followed by an Objetive Pronoun (such as me, him, her, us) and not a Subjective Pronoun (such as I, he, she, we) Hence, between you and me is the right usage