The correct answer is B) utilitarian influence.
Cuidado, a nonprofit organization that focuses on caring for the elderly, encourages its members to do as much as possible for the welfare of old people. At the end of each year, one individual is voted as the "Care Member of the Year." The member also receives a free holiday package for two. The type of group influence that most likely motivates the members of Cuidado to care for the elderly is a utilitarian influence.
Utilitarian influence is the compliance of a person in order to get rewards for its actions. In this case, people are motivated to help the elderly because besides this is a good thing that shows compassion for others, at the end of the year there is a reward that includes a free holiday package for two if the individual is voted "Care Member of the Year."
The other options of the question were A) informational influence, C) value-expressive influence, and D) situational influence.