Which of the following best describes 'glut'?

The term 'glut' refers to an excessive amount or oversupply of something. When we say there is a glut of a product, it indicates that there is more of that product available than is needed or consumed, which can lead to decreased prices or wasted resources due to the inability to sell excess items. This definition aligns precisely with the idea of having an oversupply.

The other choices depict scenarios that do not match this meaning. A brief shortage of supply would imply a lack or deficiency, which is the opposite of a glut. An adequate supply suggests a balance that is neither too much nor too little. A perfect balance of needs would indicate an ideal state without excess, again contradicting the concept of a glut. Thus, the best description of 'glut' is indeed an oversupply of something.