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: Water becomes more dense when it is colder and when it has more salt.
 Question: What happens to water when it absorbs less salt? 
 Choices: A)lower density 
B)Higher Density
[EX A]: lower density

[EX Q]: Paragraph: Many of the worlds people live with water scarcity, and that percentage will increase as populations increase and climate changes.
 Question: Will increases the population of his model of the world's population. The amount of water scarcity, if no other variables are changed, will likely go 
 Choices: A)up 
B)down
[EX A]:
up