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: Lower rock layers were laid down earlier, so they are assumed to contain older fossils.
 Question: Sean digs in the dirt and finds rocks that are buried very shallowly. Given how deep they were, Sean can assume that these rocks are 
 Choices: A)younger 
B)older

A: younger
****
Q: Paragraph: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.
 Question: Ian sees an object with few colliding particles, and he compares it to another object with few colliding particles. Which is true about the objects? 
 Choices: A)the object with many colliding particles has a lower concentration of particles 
B)the object with many colliding particles has a higher concentration of particles

A: the object with many colliding particles has a lower concentration of particles
****
Q: Paragraph: The trade-off when the threads are closer together, is that more turns of the screw or bolt are needed to do the job because the distance over which the input force must be applied is greater.
 Question: Dawn is screwing in a screw so she can hang a picture on the wall. Because the threads are really close together, the force that Dawn must apply to get the screw into the wall is 
 Choices: A)greater 
B)lesser

A:
lesser
****