a non-profit organization wanted to recognize the volunteer who have planted the most trees during her assigned volunteer time at the community event based on rate of planting which volunteers should receive the recognition? Volunteer c, who planted 15 trees curing the assigned 45 minutes, Volunteer D, who planted 7 trees duing the assigned 20 minutes, Voulnteer A who planted 20 trees during the assigned 60 minutes or Volunteer b who planted 25 trees in the assigned 1 hour 15 minutes