What is the process of subduction

Subduction is a geological process that takes place at convergent boundaries of tectonic plates where one plate moves under another and is forced to sink due to high gravitational potential energy into the mantle. Regions where this process occurs are known as subduction zones.

atomic = no of protons.

mass number-atomic number = neutron number

the answer is f1 and d2 because if you put equal force on those two points the beam would balance trust me on this