Which of the Following Statements Is LEAST-Likely True

Which of the following statements is LEAST-Likely true?

A) Chlorinated solvents are not flammable but when exposed to flame can become phosgene gas.
B) Solvents can cause irritation and damage to your skin, eyes, and respiratory tract, including the nose and throat.
C) Some solvents, such as MEK, can be absorbed through the skin.
D) Not all organic solvents can cause skin problems.