Question

to show how one fact relates to another in a document - based essay, a writer should
include an effective
transition.
draft a strong
conclusion.
find facts from an
unbiased source.
cite sources in the
proper format.

Explanation:

To show the relationship between facts in a document - based essay, an effective transition is used to connect ideas and show how one fact relates to another. Drafting a strong conclusion is for summarizing the essay, finding facts from an unbiased source is for gathering accurate information, and citing sources in proper format is for giving credit to sources, none of which directly show the relation between facts.

Answer:

A. include an effective transition.