Which action is due to field forces? select one of the options below as your a. an apple falling from a tree b. a moving car stopping when the brakes are applied c. the rowing of a boat d. pushing a chair against the wall

Field force is when the force which you  exert on prticular subject acts only on this subject, other subjects that sorround yours are not included, whereas the  like gravity acts equally on everything. So the correct answer is D. pushing a chair against the wall.

The masses of the objects and their densities