As Part of a Research Project,Carmen Attended the Birthday Party

Multiple Choice

As part of a research project,Carmen attended the birthday party of a child.When the cake was served,Carmen was asked to teach everyone the "Happy Birthday Song" in English.After the cake,presents were opened,including the gift from Carmen.What part of this event was problematic for Carmen's research?

A) Carmen's presence influenced events at the party.
B) Teaching the English song distracted Carmen from other observations.
C) Carmen should not have attended the child's party.
D) Carmen should not have given a gift to a research participant's family member.