Answer:
If other assets are unchanged, stockholders' equity must be decreasing.
Explanation:
By using Accounting Equation as follow:
Asset = Equity + Liability
Tot make the equation balance we have to ensure that the effect on it will also has balancing effect.
Decrease in assets might result in decrease in equity or liability and increase in other assets, but here the liability is constant. There could be only two effect that decrease in equity and increase in other asset. There is no option which shows the increase in other asset. So the decrease in equity is the option will has correct effect to balance the accounting equation all other dis-balance the equation.