The parts of the speech are arranged in the correct order in option (a): During (prep), that (demonstrative adj), epidemic (n), early (adj), warnings (n), circulated (v), widely (adv)."
"During" denotes the preposition of time, "that" modifies or changes the noun epidemic, "early" modifies or changes the noun warnings, "circulated" performs as an action word, "widely" modifies the verb circulated.
As a result, option (a) or (i) is the correct analysis of the parts of speech in the sentence.
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