Which of the following statements about the information in the graph is most likely to be true? A.
Human activities contributed to the increase in carbon dioxide levels that occurred during the Jurassic geologic period.
B.
During the Permian geologic period, the amount of carbon dioxide in the atmosphere increased due to natural processes.
C.
Carbon dioxide levels are higher today than they have been at any other time in geologic history.
D.
During the Carboniferous geologic period, carbon dioxide levels reached their highest point in geologic history.

Voters commonly condemn politicians for being insincere, but politicians often must disguise their true feelings when they make public statements. if they expressed their honest views—about, say, their party's policies—then achieving politically necessary compromises would be much more difficult. clearly, the very insincerity that people decry shows that our government is functioning well. which of the following, if true, most seriously undermines this reasoning? (a) achieving political compromises is not all that is necessary for the proper functioning of a government. (b) some political compromises are not in the best long-term interest of the government. (c) voters often judge politicians by criteria other than the sincerity with which they express their views. (d) a political party's policies could turn out to be detrimental to the functioning of a government. (e) some of the public statements made by politicians about their party's policies could in fact be sincere.