Which side of the original parallelogram corresponds to the y-centimeter side of the enlarged parallelogram? Explain how you know.

A small parallelogram has a left side length of 10 centimeters and a top side length of 15 centimeters. A larger parallelogram has a left side length of x centimeters and top side length of y centimeters.
Not drawn to scale

The ____-centimeter side corresponds to the y-centimeter side.
10 cm because both are the shorter sides of the parallelogram
10 cm because both are the longer sides of the parallelogram
15 cm because both are the shorter sides of the parallelogram
15 cm because both are the longer sides of the parallelogram