Final answer:
Increased communication challenges and resistance to change are primary growing pains of implementing a matrix organization, along with issues like work overload and ambiguous managerial roles.
Step-by-step explanation:
Growing pains in implementing a matrix organization can arise from a variety of factors related to the complexity and challenges of operating in such an environment. One notable challenge is B. Increased communication challenges, as a matrix structure means that employees may report to multiple managers for different projects, which can complicate information flow and decision-making processes. Another issue can be D. Resistance to change, as employees accustomed to a traditional hierarchy might struggle to adapt to the shared authority and team-based approach of a matrix organization. Finally, conflicts such as work overload and ambiguous managerial roles can also contribute to difficulties in a matrix setting. Although answers like A (Lack of employee training) and C (Limited project flexibility) could contribute to organizational challenges, they are not typically inherent to the matrix organization itself.