Question

click on the wave that has the larger wavelength.
simulations used in this interactive are by phet interactive simulations
university of colorado boulder, licensed under cc - by - 4.0 (https://phet.colorado.edu).

Explanation:

Wavelength is the distance between two consecutive crests (or troughs) of a wave. By visually comparing the two waves A and B, wave B has fewer crests in the given space, indicating a larger distance between consecutive crests.

Answer:

B.