What is the amplitude of y=1/2 sin2x

Amplitutde:

Normally for sinx amplitude is 2 (1 +1). In the case when it is half sine amplitude is halved, therefore 0.5 +0.5 = 1 Paramers alpha = 2x does not matter because it only stretches the graph horizontally.

Where are the

Ibelieve the answer is b. y=0 would make the line horizontal across the x.