The odd numbers are divided as follows:
Row $1$: $1, 3$
Row $2$: $5, 7, 9, 11$
Row $3$: $13, 15, 17, 19, 21, 23$
Then the sum of the $n^{th}$ row is:

• A
  $n^3 + (n-1)^3$
• B
  $n^3 - (n-1)^3$
• C
  $2n^3$
• D
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