Answer:
The answer is option C.
Step-by-step explanation:
A penalty kick and how it is taken is described in the question. The researcher is interested in knowing whether to goalkeeper is just guessing the direction of the ball or observes the player's movement and acts accordingly. So in this case, we can see that the variable of interest is whether the direction that the goalkeeper jumps is correct or not. So the answer is option C.
I hope this answer helps.