It is B.
You need to identify their turning points by calculus or algebraic method.
lets use calculus method
y = 5-x2
f'(x) = 2x
the derivative is 0 only at turning point
0 = 2x
y = 5- (2x0)
Turning point for y = 5-x2 = ( 0, 5) and it minimum since the coefficient of x2 is negative.
y =2x^2+ 2
y = 2(o) + 2
y = 2
So it turning point is (0, 2) and it is maximum since coefficient of x2 is positive.
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