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: As more resistors are added in series, the total resistance of the circuit increases.
 Question: If Ed adds a resistor to the circuit, the resistance will be 
 Choices: A)greater 
B)lower.
[EX A]: greater

[EX Q]: Paragraph: Acids have pH values below 7. The lower the pH value, the more strongly acidic the substance.
 Question: Milo was playing around with water by changing the pH level. If he lowered the pH what would happen to the acidity of the solution? 
 Choices: A)it would decrease 
B)it would increase
[EX A]: it would increase

[EX Q]: Paragraph: By using multiple stages, empty fuel containers could drop away. This reduced the mass of the rocket so that it could fly higher.
 Question: If Mary is building a rocket and she wants it to fly as high as possible, what should she do to the mass of the rocket? 
 Choices: A)increase it 
B)decrease it
[EX A]:
decrease it