Which of the Following Is the Best Example of Multimethod

Which of the following is the best example of multimethod assessment?

A) A psychologist asks a parent and a teacher to complete a rating scale about a child's behavior.
B) A psychologist observes a child at school and then asks a teacher to complete a rating scale about the child's behavior at school.
C) A psychologist asks gathers data from parents about the child's behavior at home, at school, and at home on the weekend
D) A psychologist uses self-report questionnaires from parents, teachers, and the child to assess the child's mood