Which term best describes a collection of different styles offered by a designer?

The term that best describes a collection of different styles offered by a designer is "line." In the fashion industry, a "line" refers to a grouping of garments that a designer produces and presents together, typically during a fashion season. These lines can embody various themes, styles, and sometimes even narratives that reflect the designer's vision for that particular collection. Each line may contain a set of coordinated pieces that are intended to work together, allowing for a cohesive presentation that resonates with the intended audience or market segment.

The other terms like "range," "batch," and "series" do not specifically capture the concept of a collection of styles in the same way. "Range" often refers to a broader category of products over a longer time, while "batch" typically implies a quantity produced at one time without necessarily denoting diverse styling. "Series" might suggest a sequential or thematic grouping but lacks the connotation of fashion distinctiveness that "line" embodies. Thus, using "line" effectively communicates the comprehensive approach a designer takes to showcase their creative work through various styles.