Final answer:
Rene can make 12 treat bags containing 4 brownies and 5 sugar cookies each.
Step-by-step explanation:
To determine the greatest number of identical treat bags Rene can make, we need to find the greatest common divisor (GCD) of 48 and 60. The GCD of 48 and 60 is 12. Therefore, Rene can make the most identical treat bags by dividing both the brownies and sugar cookies by 12.
Each treat bag will contain 4 brownies (48 divided by 12) and 5 sugar cookies (60 divided by 12). Therefore, the correct option is D. 12 treat bags with 4 brownies and 5 sugar cookies each.
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