An electrical insulator is a material that: A) contains no charge
B) does not allow electrons to flow
C) has more protons than electrons
D) must be a crystal

Option B is appropriate for this question

An electrical insulator is a material that

Explanation:

does not allow electrons to flow

the force required to move the cart is divided by three or 33.33 n.

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form