What is the meaning of "spectrum"?

The term "spectrum" refers to a range of different but related ideas, qualities, or entities that exist along a continuum. In various contexts, such as in science or art, a spectrum can illustrate how various elements might be interconnected or vary in degrees. For example, in physics, the color spectrum demonstrates how light can transition smoothly between different colors. In discussions around social or political issues, a spectrum can represent a wide variety of opinions or beliefs that fall within a certain framework. This understanding reinforces the idea that "spectrum" captures diversity and gradation among related elements rather than implying strict divisions or unrelated groups, which aligns perfectly with choice A.