Communication is the imparting or exchanging of information by speaking, writing, or using some other medium. means of sending messages, orders, etc., including telephone, telegraph, radio, and television are some means of communication. Asking students to collect and classify pictures of means of communication will make students familiar with the appearance of different means of communication and their types verbal and nonverbal. Moreover asking students only to classify the pictures of different means involves learning by doing where meaningful learning takes place.Students already have several experiences in their daily life. They share their experiences with a lot of enthusiasm and energy. This discussion leads to better learning as students remain active and their role is considered as the center of the discussion.?Hence A & C are the correct options. Additional InformationShowing PowerPoint presentations and videos may make students passive recipients of knowledge and meaningful learning doesn't happen where the involvement of students is less. So remaining options are not so good to deliver the topic in a meaningful manner.