Final answer:
Cartesian coordinates (option a) are the most convenient set of coordinate axes to use in this problem.
Step-by-step explanation:
The most convenient set of coordinate axes to use in this problem would be Cartesian coordinates (option a).
Cartesian coordinates, also known as rectangular coordinates, are a convenient choice when dealing with problems on a flat plane. They use a system of orthogonal directions given by the x-axis and the y-axis.
Polar coordinates (option b) are better suited for describing rotation, while cylindrical coordinates (option c) and spherical coordinates (option d) are used when working in three-dimensional space.