Combine Like Terms to Simplify the Expression $z ^ { 3 } + 4 z ^ { 2 } + z + z ^ { 2 } + 6 z + 1$

Multiple Choice

Combine like terms to simplify the expression $z ^ { 3 } + 4 z ^ { 2 } + z + z ^ { 2 } + 6 z + 1$ .

A) $14 z ^ { 9 }$
B) $z ^ { 3 } + 13 z ^ { 2 }$
C) $z ^ { 3 } + 5 z ^ { 2 } + 7 z + 1$
D) $13 z ^ { 9 } + 1$
E) $z ^ { 3 } + 12 z ^ { 2 } + 1$