Question

click on the wave that has the higher frequency.
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:

Step1: Understand the concept of frequency

Frequency is the number of wave cycles per unit time.

Step2: Compare the two waves

Wave B has more cycles in the same space (or time - equivalent in visual representation) than wave A.

Answer:

B