I guess it will be C: atoms and molecules because according to Jhon Dalton's atomic theory :"all matter is made up of atoms" and even if we think of other options think it by urself that not all matter is made up of them
An isometric contraction occurs as the muscle produces tension without changing the angle of a skeletal joint. Isometric contractions involve sarcomere shortening and increasing muscle tension, but do not move a load, as the force produced cannot overcome the resistance provided by the load.
