Jeffrey is using a pulley to get water from a well. He loops a rope over the top of a pulley wheel, then ties the rope to a bucket. He lowers the bucket into the water. To bring the bucket and water up from the well, Jeffrey pulls down on his end of the rope. Why does Jeffrey apply a pulling force to the rope? A. because work must be done on the pulley before it can do work on the bucket B. to signal to the pulley to start drawing water from the well C. to test the tension in the rope before he uses it to climb down into the well D. because adding his force to the force generated by the pulley will get the job done faster