Answer: The correct answer for the blank is-
A) absorption.
Absorbent materials are those that have potential to absorb another substance. For instance, a mass of interlacing fibers with pores, forms the internal skeleton of various aquatic lives and used to absorb water or any substance.
As per the information in the question, sound proof tiles are made of a porous surface (with lots of holes) so that sound is not transmitted from one room to another room.
This means that sound waves are absorbed in between so that sound waves does not transmit from room and room.
Thus, option A) is the right answer.
