Final answer:
The MA should remove the tourniquet first to alleviate the patient's symptoms of feeling faint, pallor, and sweating.
Step-by-step explanation:
In this situation, the medical assistant (MA) should first remove the tourniquet (option a).
If the patient is feeling faint and showing signs of pallor and sweating, it indicates that they are experiencing vasovagal syncope, which is a common reaction to medical procedures.
Removing the tourniquet and allowing blood flow to resume will help alleviate the patient's symptoms and prevent them from fainting.