Final answer:
The Half Boston Crab refers to a variation of the Boston Crab wrestling move, where only one leg is involved.
Step-by-step explanation:
The wrestling move represented by the Half Boston Crab is correctly referred to as option 1) Boston Crab. In wrestling, the Boston Crab is a submission hold that involves one wrestler lying on their back with their legs up, while the other wrestler takes hold of both legs, sits down on their back, and bends them backward toward the head. The name Half Boston Crab, as noted by the number (124), likely refers to a variation where only one leg is captured, and the pressure is applied similarly.