Distance between any two consecutive nodes is

Nodes and antinodes are known to generate the stationary waves. In a given stationary wave, the distance between any given two successive nodes or any two successive antinodes is always half of the wavelength. The distance between the two successive nodes is λ2.

The distance between two consecutive compressions or rarefactions in a wave is called the wavelength. Let us know more about the terms compressions, rarefaction and wavelength.

i am pretty sure it is c because when people are closer together, they cannot move as freely. picture being in a mostly full elevator, for instance. the people are right next to you, and you can barely move.