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: An object has greater momentum if it has greater mass, greater velocity, or both.
 Question: If an big eighteen wheeler and a small wagon are both rolling down a small hill, which has less momentum? 
 Choices: A)small wagon 
B)eighteen wheeler
small wagon