A project manager has recently been assigned to an agile project and discovers that a...

 The project manager should consult the project team to understand the extent of the training needs for the contractor. This is consistent with the agile value of individuals and interactions over processes and tools1. The project manager should also collaborate with the contractor to provide them with the necessary guidance and coaching on the agile principles and practices2. Asking the project sponsor to replace the contractor since they do not have agile experience (A) is not a good option since it may cause unnecessary delays and costs for the project. Issuing a formal notice to the contractor to obtain an agile certification (B) is also not appropriate since it may create a sense of distrust and resentment in the contractor. Instructing the contractor to receive agile training since the project has already started (D) is not a sufficient action since it does not address the specific needs and expectations of the project team and the contractor. References:

1: Agile Practice Guide, Chapter 1, Section 1.2.1

2: Agile Practice Guide, Chapter 2, Section 2.3.2.2