Final answer:
In GMAW welding, voltage and wire feed speed are the two typical control adjustments that influence the heat of the arc and the rate of welding wire fed into the weld pool, respectively. Hence, the correct answer is option (A).
Step-by-step explanation:
The two control adjustments typically found on GMAW (Gas Metal Arc Welding) welding power sources are voltage and wire feed speed. Voltage controls the heat and size of the arc, while wire feed speed determines the rate at which the welding wire is fed into the weld pool, directly affecting the welding speed and penetration.
These adjustments are crucial for achieving a proper weld bead and penetration depending on the type of workpiece and welding position.