At what point will the Service Cloud developer see the conflict and need to resolve the conflict?

Universal Containers (UC) started to use the GitHub workflow. For the current minor release, an Experience Cloud developer and a Service Cloud developer both need to work on the Case object and codes that reference the Case object. Both developers branched off the same UCDev branch (maps to the Dev sandbox for Release Build) and started working. The Experience Cloud development team had

Finished early, and the change was successfully merged into the UCDev branch. The local Git branch used by the Service Cloud developer is called ServiceCase

At what point will the Service Cloud developer see the conflict and need to resolve the conflict?
A . At command: git commit -m “Service Cloud Notes”
B. The conflict would show in GitHub when a pull request is created from ServiceCase to UCDev.
C. At command: git push origin ServiceCase
D. At Command: git add force-app/main/default

Answer: B