You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: Less photosynthesis means that plants and phytoplankton produce less food.
 Question: If Mona owns a greenhouse and she decides to cover the top up to restrict sunlight, what happens to her plant's ability to make food? 
 Choices: A)increases 
B)decreases
decreases