What is the typical structure of a DATA step using the DATALINES statement?

The typical structure of a DATA step using the DATALINES statement is represented by the option that includes a clear delineation of the dataset name, an INPUT statement specifying the variables, and the DATALINES statement followed by the actual data values.

In a DATA step, the DATA keyword initiates the creation of a new dataset, and "datasetname" specifies what that dataset will be called. The INPUT statement is used to define the variables that will be present in your dataset, specifying their names in the sequence they will appear. The DATALINES statement indicates that the data will follow immediately in the lines that follow it. Finally, the RUN statement is included to execute the DATA step.

The structure provided in the correct choice encompasses all these components: it starts with the DATA statement to define the dataset, specifies variables with the INPUT statement, uses DATALINES to indicate where the data input begins, and ends with the RUN statement to complete the operation.

The other options either lack crucial components, include incorrect syntax, or misrepresent the structure. For instance, while one option attempts to use variables within the DATALINES section, it doesn't correctly follow the required format to separate variable definitions from the data itself.