Which of the following sentences includes a pronoun with an unclear antecedent? The largest twentieth century earthquake, which reached a magnitude of 9.5, occurred in
southern Chile.
People who have lived through extreme earthquakes report feeling terror and helplessness
when the earthquake hits.
In places as far away as Japan, they died because of the tsunami caused by the earthquake.
Members of the US Geological Survey say they believe past earthquakes may have been larger,
but the Chilean earthquake is certainly the largest since accurate magnitude measurements
were invented.

answer; i believe that the correct answer is (scientific data);

answer: from these honored dead we take increased devotion to that cause for which they gave the last full measure of devotion—that we here highly resolve that these dead shall not have died in vain, that this nation under god shall have a new birth of freedom, and that government of the people

explanation:

hm, switch the relative; nominative and indefinite; objective ? not too bright in the knowledge of the english.

basic principle: a pronoun usually refers to something earlier in the text (its antecedent) and must agree in number — singular/plural — with the thing to which it refers. the indefinite pronouns anyone, anybody, everyone, everybody, someone, somebody, no one, and nobody are always singular.