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: Smoking reduces the amount of oxygen available for diffusion at the lungs, so less oxygen gets absorbed and blood is oxygenated to a lesser degree.
 Question: Will is smoking a cigarette. This causes _____ oxygen to be available for diffusion in his lungs, so less oxygen will be absorbed into his blood. 
 Choices: A)more 
B)less
less