Q: 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: It would be hard to get a big chunk of chocolate to dissolve in your milk or hot water. Maybe you could make hot chocolate from some smaller pieces like chocolate chips, but it is much easier to add a powder to your milk. This is because the smaller the pieces are, the more surface area they have.
 Question: Mary melts a 1 pound chocolate bar and 1 pound of chocolate chips in two pots. Which melts last? 
 Choices: A)bar 
B)chips
A:
bar