The correct answer is the option that fails to return a new DataFrame due to syntactical issues or incorrect usage of methods. In option A, `col("storeId")` and `col("employeeId")` should not be used with Seq, as Seq expects a collection of strings representing column names. Instead, it should simply be `Seq("storeId", "employeeId")`. This misuse of the `col` function in option A leads to a failure in executing an inner join, making option A incorrect.