Answer: The correct option is
(C) The unit rates are equal.
Step-by-step explanation: We are given to choose the lowest price per ounce from the following choices :
Choice A: 10 ounces of chocolate chips for $1.66.
Choice B: 20 ounces of chocolate chips for $3.32.
For Choice A :
Price of 10 ounces of chocolate chips = $1.66.
So, the price of 1 ounce of chocolate chips will be

For Choice B :
Price of 20 ounces of chocolate chips = $3.32.
So, the price of 1 ounce of chocolate chips will be

Therefore, the price per ounce of both the choices A and B are equal.
Thus, the unit rates are equal.
Option (C) is CORRECT.