A timeline must include
Dates.
pictures
definitions
paragraphs.

it must include dates

Explanation:because a timeline has important stuff on it so it has to have dates

dates

Explanation:

dictionary definition:

time·line

/ˈtīmlīn/

noun

a graphic representation of the passage of time as a line.

now, our keyword in that definition is "time" corresponding words in these options are dates and time. all other 3 options do not correspond w time and therefor could not be correct.

explanation:

if you’re a fan of chocolate, every occasion is right for this treat. feeling down? eat some chocolate. celebrating? eat some more. want to show your valentine how special you think your sweetheart is? offer up chocolate!   people have been enjoying chocolate as a food, drink and medicine for thousands of years. the ancient maya and aztecs called chocolate kakaw and used it as medicine. they also made chocolate offerings to their gods. chocolate comes from the cacao (kuh-kow) tree, and its scientific name reflects its history. theobroma cacao translates to “cacao, food of the gods.” these days, chocolate is not just for deities. the treat has become popular around the world.

the answer is not