ANS:C - timesharing

Time-sharing was developed out of the realization that while any single user was inefficient, a large group of users together was not. This was due to the pattern of interaction: Typically an individual user entered bursts of information followed by long pauses; but a group of users working at the same time would mean that the pauses of one user would be filled by the activity of the others. Given an optimal group size, the overall process could be very efficient.