Answer:
d. As depth increases, temperature decreases quickly at first, but eventually becomes constant.
Step-by-step explanation:
As seen on the graph above, the temperature decreased quickly as the depth increased. It is seen between 200 meters to 500 meters in depth. The change in temperature is from 26 degrees to 8 degrees, which is an 18-degree difference. After which, the temperature decrease slows down and becomes constant starting at 2,700 meters going deeper to 4,000 meters. The temperature is being maintained at 1 degree.
The other three choices above (a, b, and c) show both an increase in temperature with an increase in depth. This makes the choices incorrect.