Which of these parts of an informational text supports a central idea?

A. transitions

B. dialogue

C. citation of sources

D. evidence

C. citation of sources

The part of an informational text that supports a central idea is D. evidence. Evidence refers to the specific facts, examples, statistics, or other types of information used to support or prove a claim or central idea. It provides support and credibility to the central idea by presenting reliable information that reinforces the author's argument.