Responsible for the majority of serious delinquent acts.
a. lower-class youth
b. middle-class youth
c. upper-class, rebellious youth
d. social class is irrelevant to

(A) Lower class youth

Explanation:

 According to the given question, the lower class youth are basically responsible for various types of delinquent acts  which include the violence in the home and also in their social group, poor education and the bad school attendance. This occur due to the cause of lack of education and less interaction with the parents.

The lower youth is one of the stage in life where the child get easily influenced by other harmful things so we should always more careful about the delinquent acts.

Therefore, Option (A) is correct.

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