Respuesta :
I just researched a little bit, and got this answer: To ensure that your refrigerator is doing its job, it's important to keep its temperature at 40 °F. so I would say C is the answer... I think
it seems to me the answer would be 39. Here's why, 10 and 20 degrees would freeze your food so you wouldn't want that. Then 52 degrees would keep it to warm. 39 seems to be the best answer.