Final answer:
The phases of gait involving single limb support are mid-stance and terminal stance.
Step-by-step explanation:
The phases of gait that involve only single limb support are mid-stance and terminal stance.
During these phases, the body's weight is entirely supported by one limb while the other limb is in swing, preparing for its next contact with the ground.
The initial contact and loading response phases represent the beginning of the gait cycle when weight is being transferred onto the leading leg, and both feet may still be in contact with the ground.
Therefore, B) Mid-stance & terminal stance is the correct answer.