Write the Expression as a Single Logarithm $$\frac { 1 } { 3 } \left[ \log \left( a ^ { 2 } + 2 a \right) - \log ( a + 2 ) \right]$$

Write the expression as a single logarithm. Assume all variables represent positive real numbers. $$\frac { 1 } { 3 } \left[ \log \left( a ^ { 2 } + 2 a \right) - \log ( a + 2 ) \right]$$

A) $\log \sqrt [ 3 ] { a }$
B) $\log \sqrt [ 3 ] { a ^ { 2 } + a - 2 }$
C) $\log _ { 1 / 3 } \left( a ^ { 2 } + a - 2 \right)$
D) $\log \left( a ^ { 3 } + 4 a ^ { 2 } + 4 a \right) ^ { 1 / 3 }$

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