When magnified 1,000 times by an electron microscope, the image of a certain circular piece of tissue has a diameter of 5 centimeter. The actual diameter of the tissue, in centimeters, is  Choose the correct choice:
A) 0.005
B) 0.002
C) 0.001
D) 0.0005
E) 0.0002

Rationale: "it is very easy if x is the diameter , then the magnified length is 1000 x . ince 1000 x = 5 then x = 5 / 1000 = 0.005 . the answer is a"
Answer: A