What part of the wave determines how much energy it has? a.)amplitude b.)period c.)velocity d.)wavelength

The energy transported by a wave along a string is of the form
E = (1/2)ρω²A²v
where
ρ = mass density per unit length
ω =  angular velocity
A =  amplitude
v = wave speed = wavelength/period

Of the four choices given, the amplitude is squared, therefore it will determine maximum energy.

A. amplitude