There isn't a specific 'most common eating disorder', but most people would have a disorder known as binge eating disorder, which is eating more than necessary. The other top 2 include anorexia nervosa or bulimia nervosa.
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Your answer would be D. You can find the neutrons by subtracting the mass by the atomic number. 14-6=8 neutrons.
Carbon dioxide because every other option requires an input.
Eat It because it tastes really really good