Read this excerpt from al gore's nobel prize acceptance speech: we, the human species, are confronting a planetary emergency — a threat to the survival of our civilization that is gathering ominous and destructive potential even as we gather here. which statement best describes how word choice establish style in the excerpt? a. the use of words such as "we" and "gather" establish a friendly style. b. the use of words such as "planetary" and "potential" establish a formal style. c. the use of words such as "human" and "threat" establish a humorous style. d. the use of words such as "ominous" and "destructive" establish a casual style.