Please note this question has a single correct answer. Gary is

increasingly showing behaviour problems. He lies, is disobedient,

uncooperative and aggressive and often refuses to go to school. His

parents react with strategies such as threatening, shouting and hitting.

This causes Gary to retaliate and shout and hit back. This reciprocal

behaviour results in an unpleasant power struggle to such an extent that

the parents ultimately give in. Accordingly, it can be assumed that

a/an … behaviour pattern occurs in this family.