It would be A the elbow or wrist because the appendicular region is basically limbs (arm,legs,toes,feet,fingers,hands)
Hope this helps
Have a great day/night
D neither a nor b is right
Target heart rate. It will keep you steady.
True, When the lava melts, It can make islands, bury towns, and so much more! Hope I helped!
Interact would be the answer
Hope it helps!