Correct answer: C. The carrots will rot.
This is the fact that fruits and vegetables have natural plant hormone called ethylene. The mangoes releases ethylene that can make the carrots rot prematurely for they are ethylene sensitive.
Moreover, this ethylene triggers cells to degrade, making fruits and vegetables become soft, droop or sweeter. So, to prevent this, keep ethylene-sensitive fruits and vegetables such as carrots, unripe bananas, asparagus and strawberries separate from varieties that emit the gas like mangoes, nectarines, potatoes and tomatoes.