PLEASE I NEED THIS ANSWER NOWWWW

Two waves are traveling in phase, as shown below. The waves have the same amplitude and frequency.



If these two waves are superimposed, the combined waveform will have
A.
double the frequency but the same amplitude.
B.
the same wavelength but double the frequency.
C.
the same frequency but double the amplitude.
D.
double the wavelength but the same amplitude.