Answer: Storming stage
Explanation: In simple words, it refers to the stage in which conflict between members of a group starts happening due to arise of individual personalities. This is last and most crucial stage of team development process.
In this stage the performance of team starts declining due to lack of harmony and trust among the members of the team. In the given case, Roger's team has been facing conflict over the controlling issues ,hence, we can conclude that they are at storming stage of development.