Answer:
conservation (B)
Step-by-step explanation:
though all of the options on edginuity are ways to improve air quality we want the one with the least new technology involvement. these are the options on edge:
a. exhaust scrubbing
b. conservation
c. using renewable energy sources
d. driving fuel-efficient cars
vehicles are new technology, and so are renewable energy sources so the answer is conservation. Conservation is just helping the environment and you can "conserve" the environment in many ways.