Years after he barely survived an attack that killed his wife and two children, Mr. Pukari suffers recurring flashbacks and frequent nightmares of the event. They render him incapable of holding a steady job. Mr. Pukari is most clearly showing signs of

   Post-traumatic stress disorder

Explanation:

Post-traumatic stress disorder (PTSD) is a mental  disorder which occurs due to an individual witnessing or being exposed to a fearful or dangerous events or traumas which with time causes such individual to develop symptoms of post-traumatic stress disorder such as difficulty in sleeping  due to nightmares,lack of concentration, occasionally on guard, irritations etc.

Here, Pukari suffers  Post-traumatic stress disorder as a result of the fearful experience he witnessed in the killing of his wife and children and so has developed symptoms of  the disorder such as lack of concentration  due to recurring flashbacks causing him have difficulties at work.

PTSD

Explanation:

post-traumatic stress disorder

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a is your answer!

answer; (c) a law code that provides believers with a set of pratical laws to regulate their daily lives