Answer:
D. [tex]-y^{4}[/tex]
Step-by-step explanation:
[tex]-\frac{1}{y^{-4} }[/tex]
Negative exponent
[tex]-\frac{y^{4} }{1}[/tex]
Rule: x/1 = x
[tex]-y^{4}[/tex]
Hope this helps!