Final answer:
Unanimous board approval indicates that Sally-Jo has successfully built a coalition that supports the decision.
Step-by-step explanation:
Sally-Jo will have successfully built a coalition that supports the decision if there is unanimous board approval. This indicates that the entire board of directors, who are responsible for making important decisions for the company, have come to a consensus and support the acquisition. It shows that Sally-Jo has been able to convince all members of the board about the benefits of acquiring the competitor.