Irina is writing a research report. She has chosen the topic of how to swim fast. She has written down all the questions she can think of about swimming. Her next step is to choose the most important questions from her list. What are two questions Irina could ask that would help her with her topic? A How much chlorine is in a typical lap pool? How long is a typical lap pool?
B What swim strokes help a person swim more quickly? Does swimsuit or hairstyle slow a person down?

C How many Americans have won Olympic gold medals in swimming? How fast did these Olympians swim?
D At what age should a child begin taking swimming lessons? At what age can a person begin participating in swimming competitions?