How many rows of piles are generally set up in freestyle skating competition? How many piles per row?
A: row 5 and 25
B: rows 2 and 18
C: rows 1 and 30
D: rows 3 and 20
A: row 5 and 25
B: rows 2 and 18
C: rows 1 and 30
D: rows 3 and 20
D
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