Final answer:
The git merge command typically merges changes from one branch into another. In this case, the master branch from a remote would be merged into the current branch, not the other way around.
Step-by-step explanation:
The git merge command is used to combine the histories of two branches together. In the context of the student's question, the command git merge remotes// master (presumably a typo and should be git merge remotes/<remote-name>/master) normally combines the history of the master branch from a remote repository into the current branch that you are working on. Without further context, it's difficult to say definitively, but typically, the correct interpretation is option B: 'Merges the master branch into the specified branch'. This means that after the command is executed, any changes that are on the remote master branch that are not yet in the current branch would be merged into it.