The young science of psychology developed from the more established fields of philosophy and Select one:
O a. economics.
O b. biology
O c. geography
O d. sociology

i think the answer is tomato juice? not entirely sure though

magnets not strong enough

explanation:

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.