What is the sum of $n$ terms of the series $1 \cdot 2 \cdot 3 + 2 \cdot 3 \cdot 4 + 3 \cdot 4 \cdot 5 + \dots$?
- A$\frac{1}{4} n (n + 1) (n + 2)$
- B$\frac{1}{4} n (n + 1) (n + 2) (n + 3)$
- C$\frac{1}{2} (n + 1) (n + 2) (n + 3)$
- DNone of these
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