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).

[EX Q]: Paragraph: The more branching there is in isomers, the lower the boiling and melting points are.
 Question: Lead has a _____ melting point than steel because it has more branching. 
 Choices: A)lower 
B)higher
[EX A]: lower

[EX Q]: Paragraph: For a given medium, sound has a slower speed at lower temperatures.
 Question: If Jim turns the thermostat down in his room while listening to music, what will happen to the speed of the sound waves in the room? 
 Choices: A)they will speed up 
B)they will slow down
[EX A]: they will slow down

[EX Q]: Paragraph: Warm air is less dense than cool air, so it rises higher in the troposphere.
 Question: If air warms, it becomes _____ dense. 
 Choices: A)less 
B)more
[EX A]:
less