The Graph Below Shows the Quantity of a Drug in a Patient's

Multiple Choice

The graph below shows the quantity of a drug in a patient's bloodstream over a period of time $t$ , in minutes.

Which of the following scenarios best describes the graph?

A) The drug is injected over a 10 minute interval, during which the quantity increases linearly. After the 10 minutes, the injection is discontinued and the quantity then decays exponentially.
B) The drug is injected over a 10 minute interval, during which the quantity increases exponentially. After the 10 minutes, the injection is discontinued and the quantity then decays linearly.
C) The drug is injected all at once. The quantity first increases and then decreases linearly.
D) The drug is injected all at once. The quantity first increases and then decreases exponentially.