Answer:
More steeper → y = 2x², y = (2x)²
Less steeper →
, 
Step-by-step explanation:
Parent quadratic equation has been given as,
y = x²
Coefficient of x² defines the nature of the graph in terms of stretch,
1).If the coefficient of x² is greater than 1 then the parent equation will be vertically stretched and will be more steeper.
2). If the coefficient is between 0 and 1, graph of the parent function will be vertically compressed and will be less steeper.
3). If a is negative, graph will be reflected across the x-axis.
From the given options,
Curves more steeper than y = x²,
y = 2x², y = (2x)²
Curves less steeper than y = x²,
, 
Curve y = -x² is the reflected form of parent function y = x²