W: What size do you wear, sir
M: Size 10 seems a little bigger, and size 6 must be small. I want to try an 8.

Which size may be suitable for the man（）

A. Because of science, most of the foods we eat today are contaminated.
B. It has caused a lack of information concerning the value of food.
C. As a result of scientific intervention, some potentially harmful substances have been added to our food.
D. The scientists have preserved the color of meats, but not of vegetables.