help on b.

Referring to question 1, answer the following questions a. What calibration method was used. Internal standard method External standard method Standard addition method b. Was this the best calibration method to use? If so why? If not, which method would be better and why? No, the internal standard method would be better because the matrix is complex Yes, because it is a simple water sample No, the external standard method would be easier because it is a simple water sample Yes, because there would be nothing in the sample that could interfere with the analysis Yes, because the matrix is complex A sample of waste water was analyzed for the presence of dioxane. To a set of volumetric flasks, 2.00mL of the original wastewater sample was added. The standard used for spiking had a concentration of 2.50ppm, and was added to each sample as shown in the table below. All samples were diluted to 10.00mL prior to analysis. Use Excel or Google Sheets to prepare a calibration curve from the data below and to find the line of best fit. Given the data in the table above, determine the concentration of dioxane in the original well water sample. ppm