Answer: A) stimulus
Explanation:
A stimulus is a factor which can bring a change in the chemical and physical structure of the organisms. The stimulus is the part of the external environment of organism. And the ability of the organism to respond to the stimulus is called as the sensitivity.
Here, music is the stimulus which brings causes you to start foot tapping which is a response towards this stimulus.
<span>Letters written in the new testament to instruct, encourage, and solve problems are called Epistles. Epistles are defined as a written letter that is directed to be sent or sent to a person or group of people. These letters are written in the new testament.</span>