To "extend" something can involve which of the following actions?

The term "extend" fundamentally means to increase the length or duration of something, which aligns perfectly with the action of prolonging an event or time period. When one extends an event, it can mean making it last longer than originally planned, such as extending a meeting, duration of a sale, or a project deadline. This action emphasizes the idea of lengthening, whether it be in terms of time or space, hence making it the correct interpretation of "extend."

The other options do not relate to the core meaning of "extend." Narrowing the scope of an argument suggests a reduction in breadth or focus, which contrasts with the idea of extending something. Changing one's position may involve shifting viewpoints or navigating between different aspects, but it does not inherently convey the act of extending. Focusing on minute details often involves a close examination, which tends to suggest a contraction of focus rather than an extension. Therefore, the only option that truly embodies the essence of the term "extend" is the one that speaks to prolonging an event or time period.