Final answer:
Temperature decreases with the passage of a frontal wave due to the decrease in masses of particles.
Step-by-step explanation:
When a frontal wave passes, there are changes in temperature. In general, temperature decreases with the passage of a frontal wave. This is because the masses of the particles decrease, and although the speed remains the same, the decrease in masses causes a decrease in temperature. Therefore, the correct answer is b) Temperature decreases.