As Part of Her Graduate Work,Liana Conducted an Ethnographic Study,which

As part of her graduate work,Liana conducted an ethnographic study,which included several participant observers - undergraduate students who received course credit for their participation across a full semester.Liana is unsure whether to include the students as co-authors on a conference proposal she is submitting,in which she summarizes the main findings of the study.Which of the following pieces of advice is her advisor most likely to give her?

A) Include them,because their participant observation required substantial intellectual contribution to the project.
B) Do not include them,because they received course credit for their participation.
C) Only include the students whose observations were used to support the conclusions you drew.
D) Include them for the conference presentation but not a later journal article,because journals have more rigid rules about shared authorship.