For the farmer who takes care to keep them cool, ______, Holstein cows are producing an average of 2,275 gallons of milk each per year.
a. providing them with high-energy feed, and milking them regularly, Holstein cows are producing
b. providing them with high-energy feed, and milked regularly, the Holstein cow produces
c. provided with high-energy feed, and milking them regularly, Holstein cows are producing
d. provided with high-energy feed, and milked regularly, the Holstein cow produces
e. provided with high-energy feed and milked regularly, Holstein cows will produce