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: If we have two materials with the same volume, the material with a higher mass will be more dense.
 Question: Tanya has a substance with mass 10kg. Logan has a substance with mass 5kg. If both substances are the same size, who has the denser substance. 
 Choices: A)Tanya 
B)Logan
Tanya