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To find the fraction of cars that are both gray and electrically powered, we first need to find the fraction of cars that are gray and then find the fraction of gray cars that are electrically powered.
Fraction of cars that are gray = 2/5
Fraction of gray cars that are electrically powered = 2/3
Fraction of cars that are both gray and electrically powered = (2/5) * (2/3) = 4/15
Therefore, the correct answer is C. 4/15.