Express the Following as a Single Fraction Involving Positive Exponents $\frac { 4 x ^ { 4 } - 5 } { x ^ { 7 } }$

Multiple Choice

Express the following as a single fraction involving positive exponents only. 4 x ^{- 3} - 5 x ^{- 7}

A) $\frac { 4 x ^ { 4 } - 5 } { x ^ { 7 } }$
B) $4 x ^ { 7 } - 5 x ^ { 3 }$
C) $\frac { 4 x ^ { 4 } - 5 } { x ^ { 6 } }$