The Following Table Gives Values For $c(x)$ , the Cost Per Foot of Drilling a Well at Per

Multiple Choice

The following table gives values for $c(x)$ , the cost per foot of drilling a well at a depth of $x$ feet. The prices given are for wells drilled on a certain ranch in Texas.

The ranch sits above a dense layer of bedrock. At what depth do you estimate that the bedrock layer begins?

A) Between 40 and 60 feet.
B) Between 100 and 120 feet.
C) Between 60 and 80 feet.
D) Between 80 and 100 feet.