The Following Graph Is the Standard Curve for Absorbance of an Analyte

The following graph is the standard curve for absorbance of an analyte.
In the laboratory,you are presented with a solution with an unknown concentration of the analyte.You measure the absorbance of the solution and determine it to be 0.40.Based on this standard curve,which of the following is the most accurate estimate of the analyte's concentration in the solution?

A) 0 mg/ml
B) 0.004 mg/ml
C) 0.007 mg/ml
D) 0.012 mg/ml