A research report concludes: 'Cities that promoted urban rooftop hydroponic farming saw an average 15% reduction in municipal green waste within two years.'
Which of the following, if true, most strengthens the argument that rooftop hydroponics caused the reduction?
Options:
(A) Hydroponic growers actively divert kitchen compost and organic green waste into biological nutrient digestors
(B) During the same two-year period, city residents ate out at restaurants twice as often
(C) Hydroponic crops use non-recirculating rockwool slabs that cannot be recycled
(D) Municipal waste collection fees doubled over the same period
Answer Key:
A
Step-by-Step Solution & Explanation
Option A provides a direct causal mechanism linking urban hydroponics to the diversion and reduction of municipal organic green waste.