Teacher: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).
Teacher: Now, understand the problem? Solve this instance: Paragraph: For a given medium, sound has a slower speed at lower temperatures.
 Question: When Dave screams outside he notices that the sound travels at different speeds in different temperatures. The sound travels slower when it is 
 Choices: A)cold. 
B)hot
Student:
cold.