It is B.

You need to identify their turning points by calculus or algebraic method.

lets use calculus method

y = 5-x2

f(x)= 5-2x

f'(x) = 2x

the derivative is 0 only at turning point

0 = 2x

x= 0

y = 5- (2x0)

y= 5

Turning point for y = 5-x2 = ( 0, 5) and it minimum since the coefficient of x2 is negative.

y =2x^2+ 2

f'(x)= 4

x= 4

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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