What alternative presentes a wrong use of the possessive case?

Communicative Language Teaching aims broadly to apply the theoretical perspective of the Communicative Approach by making communicative competence the goal of language teaching and by acknowledging the interdependence of language and communication. What this looks like in the classroom may depend on how the tenets are interpreted and applied. Nevertheless, we will follow our usual way of und erstanding the theor y and ussocia rcd practices by visiting a class in which a form of Communicative Language Teaching is being practiced. The class we will visit is one being conducted for adult immigrants to Canada . These twenty people have lived in Canada for two years and are at a high-intermediate level of English proficiency. They meet two evenings a week for two hours each class.

LARSEN-FREEMAN, Diane. Techniques and Principles in Language Teaching. 3rd ed. Oxford ; New York: Oxford University Press, 2011.