One Way to Get Fruit to Ripen Faster Is to Place

One way to get fruit to ripen faster is to place it in a paper bag with other ripe fruit.Which of the following best explains this observation?

A) Ripe fruit releases ethylene gas.
B) Ripe fruit breaks down auxins.
C) The lack of oxygen promotes photosynthesis, which ripens the fruit.
D) Ripe fruit carries fungi that attack other fruit.
E) When fruit is in the dark, it thinks it is underground and begins to germinate.