What can be the value of a if the graph of f(x) = ax² opens upward and is narrower than the quadratic parent function?

The correct answer is: 5

For |a| > 1, the shape of parabola is narrower than the parent function.
f(x)= ax²
For the function to open upwards, the value of a should be positive.
For the graph to be narrowed, a>1
5 satisfies both the conditions so it is the correct answer.