Simplify the Expression $\frac { x ^ { 7 } x ^ { 4 } } { x ^ { 4 } x }$

Multiple Choice

Simplify the expression. $\frac { x ^ { 7 } x ^ { 4 } } { x ^ { 4 } x }$ Write the answer without using negative exponents. Assume that the variable is restricted to those numbers for which the expression is defined.

A) $x ^ { 16 }$
B) $x ^ { 6 }$
C) $x ^ { 7 }$
D) $x ^ { 8 }$