Which of the Following Is of Least Concern to a Researcher

Multiple Choice

Which of the following is of least concern to a researcher in a mineral nutrition experiment?

A) purity of the chemicals used to make the nutrient solutions
B) purity of the water used to make the nutrient solutions
C) chemical inertness of the container used to make and store the nutrient solutions
D) ability of a laboratory balance to weigh very small quantities of chemicals
E) medium in which the test seedlings were grown