While waiting for the subway train to arrive, mark suddenly felt a wave of anxiety come over him. he felt dizzy, broke out into a cold sweat, and thought he was going crazy. the other people around him did not seem real. most likely, mark experienced a

anxiety

Explanation:

He probably has a fear of travelling in a train or it makes him nervous to travel in a train hence being stressed by this fact he broke into a sweat and became dizzy which are all signs of someone who is suddenly overwhelmed by a seemingly intense stressful situation to them .

The fact that he also feels that the people around him do not seem real is also a sign of being too stressed that you can't even make sense of reality or of what is real and what is not .

i want to say death; parole, probation, and fines are still being used all the time.

answer; collectivism;