Aspartame is a sweetener used in many sugar-free products, but it is not a food preservative.
The correct use of Aspartame is as a sweetener in food and beverages, not for preservation.
The other options are correctly matched:
The statement describing Aspartame as a food preservative is incorrect.
If the roots of $\sqrt{\frac{1 - y}{y}} + \sqrt{\frac{y}{1 - y}} = \frac{5}{2}$ are $\alpha$ and $\beta$ ($\beta > \alpha$) and the equation $(\alpha + \beta)x^4 - 25\alpha \beta x^2 + (\gamma + \beta - \alpha) = 0$ has real roots, then a possible value of $y$ is: