In the following passage some of the words have been deleted. Read the passage carefully and select the correct answer for the given blank out of the four alternatives.

Tons of fruits and vegetables are produced, processed, and (1)_______ on a daily basis so that we can buy them fresh. Many of these pieces of produce, however, never make it into stores. This is because many fruits and vegetables such as apricots, mushrooms, lettuce, and pears (2)_______brown or spoil over time. This reaction is also (3) _______ enzymatic browning and is one of the largest causes of (4) _____ in fruits and vegetables - even though it does not make the food harmful to eat. The name enzymatic browning comes from the (5) _______ that an enzyme within the fruit turns the fruit brown.