Which of the Following Best Illustrates Chikan, a Practice Widely

Which of the following best illustrates chikan, a practice widely criticized in Japan?

A) People who sell drugs on the street are disciplined through public "vigilante" punishment rather than facing legal actions.
B) Teachers in school are allowed to use caning as a disciplinary method on children as young as four years of age.
C) Mothers take their daughters away from the home to raise them in solitude until they reach the age of three years.
D) Adult businessmen grope schoolgirls who ride public transportation.