Answer: Option 'b' is correct.
Step-by-step explanation:
Decreasing order refers to the order that descends from highest to lowest .
But here we consider the degrees only, not the coefficient
In Option 'b' there is decreasing order of degrees,
The highest degree of that polynomial is 3 and that is written on the left most part and then descend towards the degree 0.
i.e.
[tex]x^3-7x^2-14x+9[/tex]
Hence Option 'b' is correct.