Generally Speaking, Why Are Part-Time Jobs Less Common in European

Generally speaking, why are part-time jobs less common in European countries?

A) As the school day lasts well into the late afternoon, the scheduling of part-time jobs in most European countries is not well suited to the daily routines of students.
B) Many low-class parents feel that it is inappropriate for their children to have jobs while attending school.
C) There are not as many opportunities for part-time employment in European countries as there are in the United States.
D) There are laws in many European countries that prevent schoolchildren from working.