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To find the unit rate for brake pads produced per hour, we divide the total number of brake pads produced by the number of hours.
For 3 hours: 48 brake pads / 3 hours = 16 brake pads per hour
For 6 hours: 96 brake pads / 6 hours = 16 brake pads per hour
For 9 hours: 144 brake pads / 9 hours = 16 brake pads per hour
For 12 hours: 192 brake pads / 12 hours = 16 brake pads per hour
Therefore, the unit rate for brake pads produced per hour is 16 brake pads per hour.
The answer is D. 16 brake pads per hour.