#1 two new methods for cleaning oil spills are being tested and are in phase one of their trials.
method a is a skimmer that can remove 100 gallons of oil per hour.
method b is a dispersant that breaks up the same amount of oil, 100 gallons per hour. the skimmer physically removes the oil, while the dispersant breaks it into smaller droplets so it will sink or dissipate.
if all other costs and benefits are equal, which of these products would you recommend to advance to the next trial?

a. method a because it will be less expensive
b. method a because it physically removes oil
c. method b because it provides more enviormental benefit
d. mathod b because it has been proven to remove more oil