I'd say D) Sandwich Generation
I might be wrong, but wanted to give it a shot
~ Good luck!
isreal is the arab minority in population
I believe the answer is: Changes in speed
Average people tend to become more focus and accelerate our effort when we're on the brink of finishing a certain goal.
So in the scenario above, when a sudden tense/increased movement happen in our body the researchers could perceive it as we're on the brink of finishing an action.