Final answer:
The gait cycle phases featuring single limb support are mid-stance and terminal stance, which align with option B) of the provided choices.
Step-by-step explanation:
The phases of the gait cycle that include periods of single limb support are mid-stance and terminal stance.
During mid-stance, the body weight is transferred over the stance leg, while the opposite leg (the step leg) is in the swing phase, moving forward.
The terminal stance begins as the heel of the stance leg comes off the ground, and continues until the other foot touches down for initial contact.
Combining these descriptions, we can state that B) Mid-stance & terminal stance are the phases of the gait cycle that includes periods of single limb support.
Pre-swing is a part of the terminal stance and indicates the transition to the swing phase, but it is not a separate phase where single limb support occurs.