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).

Q: Paragraph: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.
 Question: Mike is watching how particles of reactants function, and sees that they are very far apart. Considering that the concentration of them is very low, the chance of them colliding together is 
 Choices: A)high 
B)low

A: low
****
Q: Paragraph: If blood volume in the body decreases, blood pressure decreases.
 Question: After a car accident, Carla gained a lot of blood. At the hospital, the doctors tell her that her blood pressure is now 
 Choices: A)increased 
B)decreased

A: increased
****
Q: Paragraph: The more tightly packed the particles inside the material are, the more dense we say they are.
 Question: When we pack a lot of things into a box it becomes 
 Choices: A)less dense 
B)more dense

A:
more dense
****