Final answer:
To reduce a matrix to echelon form, use row operations. The calculator option to perform these operations is A) RowReduceCalc.
Step-by-step explanation:
In order to reduce a matrix to echelon form, you can use row operations. These operations include multiplying a row by a scalar, adding a multiple of one row to another row, and swapping two rows. The correct option to use a calculator to perform these row operations is A) RowReduceCalc.