The number of emails in someone's mailbox increases steadily throughout the day. At some point during the day, they check their email and get rid of about half of their unread messages. The emails then continue to increase at a steady rate from then on. Which of the following represents the number of emails in their inbox?

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During the first portion of the day, the number of emails in their mailbox increases at a steady rate. This occurs in three of the graphs. Then at some point in the day, they get rid of about half of the unread messages. This only occurs in two of the graphs. Finally, the emails continue to increase at a steady rate and this only occurs in the answer. In the second graph where the user gets rid of half the emails, the number of emails remains the same.

The Number of Emails in Someone's Mailbox Increases Steadily Throughout