# End behavior of algebraic models

Given the graph that models a real world context, answer a question about the end behavior of the graph.

### Problem

The amount of carbon-14, C, in grams, remaining in a substance is halved every 5700 years. A substance initially had 20 grams of carbon-14 present.
Which of the following graphs could model this relationship, if t represents elapsed time, in thousands of years?
Please choose from one of the following options.