Which of the Following Statements Is True

Which of the following statements is true?

A) If a substance is toxic, its toxicity is highly dependent on its form and where it is present in the environment.
B) If a substance is toxic, it is equally toxic regardless of its form or where it is present in the environment.
C) The most important factor in the toxicity of a substance is the route it enters our bodies.
D) The most important factor in the toxicity of a substance is its persistence in the environment.
E) None of these statements is true.