Given the task definition and input, reply with output. 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: Low food supply or a lack of space can lower birth rates, increase death rates, or lead to emigration.
 Question: An decrease in birth rates indicates a/an _____ in the food supply. 
 Choices: A)decrease 
B)increase
decrease