Which Recommendation Should Teachers Follow in Order to Retain Volunteers

Which recommendation should teachers follow in order to retain volunteers once they have been recruited?

A) They should be provided with a maximum amount of criticism and a minimum of positive feedback.
B) They should be given limited directions so they are not overwhelmed with new tasks.
C) They should be asked about their experiences and asked for suggestions.
D) They should be expected to provide a thank-you note or small gift to the classroom teacher.