ANSWER
The graph of y = -3x² opens downward and is wider than the graph of y = 4x²
(last option)
EXPLANATION
y = -3x² has a negative coefficient - which means that it opens downward - while y = 4x² has a positive coefficient - which means that it opens upward.
Then, the larger the coefficient (as an absolute value), the narrower the graph. Therefore, the graph of y = -3x² is wider than the graph of y = 4x².
