Answer:
Option B
Explanation:
Down slide means "Fall" of something , so reframing the question , what is the potential fall to bringing project workers on work too early ?
The fall here is when people who are going to perform the work are part of the planning process for the early stage ,more areas could be covered , because they are the ones doing the project and it gives an avenue for them to give suggestions and contribution and a way forward in the project.