Answer:
A.) the United States responded to the Pearl Harbor attack by declaring war on japan
Step-by-step explanation:
"Relative chronology" has to do with putting events in sequence relative to each other. A "chronology" or "chronological order" has to do with putting events in sequence relative to some time reference, such as a clock or calendar.
Of the examples listed, the one showing (two) events relative to one another is the example of "relative chronology:"
the United States responded to the Pearl Harbor attack by declaring war on japan