need to know which one it is a,b,c or d

Answer:
B. y=3x²
Explanation:
Given the graph below:
The graph of the parent quadratic function, y=x² has been sketched alongside for comparison.
We see that the parent function has been stretched vertically to obtain the graphed function.
From the given options, the only possible choice is:
[tex]y=3x^2[/tex]The correct option is B.