"Packing an emergency blanket is imperative", the park ranger advised the hikers, "because the weather at this altitude is unpredictable".

Bella is going to write a research paper. she chose sports as her topic, but her teacher said she must narrow or limit her topic. choose the topic that limits the broad topic of sports the most. a) a history of sports in the united states b) a history of tennis c) rules and etiquette of tennis d) training and equipment for outdoor sports