Final answer:
The correct synonym for 'post' in the context of placing guards at exits is 'deploy'. 'Deploy' suggests strategically positioning personnel, which closely matches the original intent.
Step-by-step explanation:
A synonym for "POST the remaining guards at the exits" in the context provided would be A) Deploy the remaining guards at the exits. The word 'post' in this context means to place or station people (in this case, guards) in a specific location. The term 'deploy' closely matches this meaning as it refers to the movement and positioning of military or security personnel with a strategic purpose. Option B) 'Relocate' suggests moving the guards from one place to another without indicating that they are being positioned for a strategic purpose. Option C) 'Remove' suggests taking the guards away from the exits, which is the opposite of posting them. Option D) 'Increase' implies adding more guards instead of assigning the current ones.