Answer:
log off of his account and log back in
Step-by-step explanation:
The first thing that Marcus should do would be to log off of his account and log back in. This is so that the new changes to his permissions can take effect. This should solve his problem and grant him access to all the permissions available in the Managers Group. If this does not work, then it is most likely that he is still in the previous group which has the Manager level permissions blocked. In this case he would need to leave the previous group that he is in because the blocking permissions overrides the access allowed from the Managers group.