WHAT DOES THE WORD 'NEFARIOUS' MEAN IN THE FOLLOWING SENTENCE

73. - DE THI THU DAI HOC 2013
DE THI THU DAI HOC 2013
73. What does the word 'nefarious' mean in the following sentence: To help in his nefarious plot, Booth recruited George Atzerdot to kill Johnson and David Herold andLouis Powell to kill Seward. A. unlikely B. evil C. ambitious D. old