The greater an objects mass... The? A) the less gravity it has
B) the greater the gravity it has
C) it’s gravity dosent change
D) the less weight

the answer is to check all of them! they all apply well at least i think so!

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.