Two Continuous Waves Having the Same Wavelength and Amplitude Pass

Two continuous waves having the same wavelength and amplitude pass through the same medium. They are aligned crest to crest and trough to trough so that they interfere. The resulting wave has

A) the same wavelength and the same amplitude.
B) twice the wavelength and twice the amplitude.
C) twice the wavelength and the same amplitude (or height) as each of the individual waves.
D) zero amplitude.
E) the same wavelength and twice the amplitude.