Teacher: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).
Teacher: Now, understand the problem? Solve this instance: Paragraph: If we have two materials with the same volume, the material with a higher mass will be more dense.
 Question: If there are two equal-volume objects, the least dense object will be the one with _____ mass. 
 Choices: A)higher 
B)lower
Student:
lower