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: Longer wavelength electromagnetic waves have lower frequencies, and shorter wavelength waves have higher frequencies.
 Question: For radio transmissions, shorter wavelength waves have 
 Choices: A)higher or 
B)lower frequencies.
[EX A]: higher or

[EX Q]: Paragraph: Exercising muscles increases their size, and bigger muscles have greater strength.
 Question: Brad wants to go to the gym less regularly, so that his muscles will get smaller. Another aspect of having smaller muscles means that Brad will likely be 
 Choices: A)stronger 
B)weaker
[EX A]: weaker

[EX Q]: Paragraph: At higher concentrations, particles of reactants are crowded closer together, so they are more likely to collide and react.
 Question: DJ has a solution that he adds particles to. The solution is now a _____ concentration. 
 Choices: A)higher 
B)lower
[EX A]:
higher