When people don't clearly recognize the cause of their frustration, they
a. solve their problems peacefully.
b. are said to be experiencing a minor frustration.
c. will probably strike out at any convenient target.
d. usually avoid aggression.

Answer is C. When people are frustrated and cannot figure out clearly why, they need to vent out somehow. Striking out on a convenient target distracts mind from the frustration. This is human psychology. Mind needs answers for it's frustrations, or it makes people act irrationally and violently to distract itself.

Anxiety, stress, or something like that