A river flows eastward with a uniform speed. Swimmer P aims straight toward the north bank relative to the water, while swimmer Q chooses a heading that allows arrival at a point directly opposite the starting point. Which statement correctly describes their motions relative to the ground?
a) Swimmer P reaches the north bank in the same time as swimmer Q but lands downstream from the point directly opposite the start.
b) Swimmer P reaches the north bank sooner than swimmer Q but lands downstream from the point directly opposite the start.
c) Swimmer P reaches the north bank sooner than swimmer Q and lands directly opposite the starting point.
d) Swimmer P takes longer than swimmer Q to reach the north bank and lands downstream from the point directly opposite the start.