A project is in progress and the PM is trying to understand the team’s progress on the burndown chart. The Burndown seems to be trending slower than expected, what could be the reason the PM should be least worried about?

A. Slower is not good as it shows sometimes team is inexperienced and not balanced B. Slower is not good as sometimes stories are large and not properly split C. Slower is not good as it shows sometimes that team is not collaborative enough D. Slower is not good sometimes as a lot of learning is involved which will help in future