Question

in a nonfiction article about how electricity works, the key point is: \electricity powers our homes and lives through a series of complex processes.\ this is an example of:
summary
theme
plot
central idea

Explanation:

A summary is a shorter retelling, a theme is a broader message (often in fiction), a plot is the sequence of events (fiction - focused), and the central idea is the main point of a nonfiction text. The given statement is the main point of the nonfiction article about electricity, so it's the central idea.

Answer:

D. central idea