Simplify the Following Algebraic Expression and Express Your Answer Using $\frac { - 15 b ^ { - 4 } } { - 5 b ^ { - 4 } }$

Multiple Choice

Simplify the following algebraic expression and express your answer using positive exponents only. $\frac { - 15 b ^ { - 4 } } { - 5 b ^ { - 4 } }$

A) 3
B) $\frac { 3 } { b ^ { - 4 } }$
C) 3 b
D) $-$ 3