Answer:
The correct answer is letter "C": Digital calendars.
Step-by-step explanation:
Digital calendars have the advantage of being set from any type of mobile devices such as laptops or, more convenient, smartphones allowing people to book important activities from work and their daily routine. Also, reminders can be set so individuals do not miss their appointments.
Different mobile devices offer different features on mobile agendas being the most important setting the reminders to be notified a prudent prior time from when the event will take place.