Riya and Aman sit at the same distance from a ringing bell. Riya says the sound is soft, whereas Aman finds it loud. Which of the following best explains their different perceptions?
(a) The bell sends different intensities toward each student at the same moment.
(b) Reflected sound waves undergo constructive interference at Aman’s position, making the sound stronger only for him.
(c) Their ears have different sensitivities to sound.
(d) The speed of sound in air happens to be higher near Aman, so the sound reaches him more powerfully.