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To declare a three-dimensional array large enough to represent the store's storage system, we will use three integers as indices: one for the racks, one for the shelves, and one for the videos. In this case, we will have 50 racks (indexed from 0 to 49), 10 shelves (indexed from 0 to 9) per rack, and 25 videos (indexed from 0 to 24) per shelf. In a programming language like C++, the syntax for declaring a three-dimensional array would look like this: ```cpp int storageSystem[50][10][25]; ``` In Python, you can create a three-dimensional list using list comprehension: ```python storageSystem = [[[0 for k in range(25)] for j in range(10)] for i in range(50)] ``` This creates a three-dimensional array (or list in Python) representing the video rental store's storage system with the dimensions 50x10x25, where the first dimension corresponds to the racks, the second dimension corresponds to the shelves, and the third dimension corresponds to the videos.