Respuesta :
The reason is a)The body of the refrigerator isn’t made of magnetic material.
What is ferromagnetic material ?
Ferromagnet materials are materials  which exhibit a spontaneous magnetization even in the absence of an external magnetic field .
Magnet sticks to refrigerator  if it is made of ferromagnetic material  and if magnet is not sticking to your refrigerator  that means your fridge is not made of magnetic material
correct answer is a)The body of the refrigerator isn’t made of magnetic material.
learn more about ferromagnetic material  :
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