Answer:
b. 2
Step-by-step explanation:
Amplitude in this case will be:
[tex] \frac{maximum \: displacement \: - \: minimum \: displacement}{2} [/tex]
[tex] = \frac{3 - ( - 1)}{2} [/tex]
[tex] = \frac{3 + 1}{2} [/tex]
[tex] = \frac{4}{2} [/tex]
[tex] = 2[/tex]
