You are managing a construction project. you have decomposed the work packages into activities and your client needs a time estimate of the project. Which statement best describes what you need to do? A. Guess the duration of each activity B. Evaluate each ativity to figure out how much effort it would take C. Estimate how many people it will take to perform each activity D. Understand, in calendar time, how long each activity will take E. Estimate the number of person-hours that will be required for each activity