Pick from:
[1]. The bending of a ray of light;
[2]. movement of tectonic plates;
[3]. the vibrations of soul;
[4]. tectonic plates being pushed together;
[5]. the vibrations of objects;
[6]. the vibrations of the ether;
[7]. movements in the earth's crust;
[8]. the waves of the ocean;
Given those answer options, answer the question: Fact 1: Telephones are used for communication by two people by transmitting sound. Fact 2: All sounds are waves produced by the vibrations of material objects. Given the two facts above, telephones are used for communication by two people by transmitting waves produced by what?
A:
[5].