The correct answer is E. Neither the frequency nor the wavelength is affected.
The wave frequency does not affect the speed of that wave. An increase in frequency of a wave causes a decrease in wavelength while the wave speed remains the constant. The speed of the waves is significantly higher at higher tensions. Waves travel through tighter ropes at higher speeds but at the same time we can say that the speed of a wave does not effect either frequency or wavelength of sound waves.