Respuesta :
Since the argument of the sine function is x without any scaling factor, the period is 2π, the 1st selection.
The period for a sine function is always 2pi/a where y=sin ax
If y= 3sinx then a=1 so 2pi/1=2pi
2pi =period
If y= 3sinx then a=1 so 2pi/1=2pi
2pi =period