Answer:incumbent:the holder of an office or post.
challenger:a person who engages in a contest.
liberal: (in a political context) favoring maximum individual liberty in political and social reform.
conservative: holding to traditional attitudes and values and cautious about change or innovation, typically in relation to politics or religion.
moderate:average in amount, intensity, quality, or degree.
front-runner: the contestant that is leading in a race or other competition.
dark horse:a candidate or competitor about whom little is known but who unexpectedly wins or succeeds.
The answer would be D) When the government doesn't protect their natural rights.
Behavioral economics assumes that humans may not act rationally because of genetics, learned behavior, and rules of thumb.
Behavioral economics is basically the study of psychology as it relates to economics.