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To determine the array after the first pass of the Bubble Sort algorithm, we need to understand how the algorithm works.

1. Start by considering the first two elements of the array.
2. Compare these two elements and swap them if they are in the wrong order.
3. Move to the next pair of elements and repeat the comparison and swapping process.
4. Continue this process until the end of the array is reached.
5. After the first pass, the largest element will be at the end of the array.

Now, let's consider an example array: [5, 3, 8, 2, 1]

During the first pass of the Bubble Sort algorithm, the following comparisons and swaps will occur:

1. Compare 5 and 3: Since 5 is greater than 3, swap them. Array becomes [3, 5, 8, 2, 1]
2. Compare 5 and 8: No swap needed. Array remains [3, 5, 8, 2, 1]
3. Compare 8 and 2: Since 8 is greater than 2, swap them. Array becomes [3, 5, 2, 8, 1]
4. Compare 8 and 1: Since 8 is greater than 1, swap them. Array becomes [3, 5, 2, 1, 8]

After the first pass, the largest element (8) is at the end of the array. The resulting array is [3, 5, 2, 1, 8].