The MAIN purpose of this selection is

A) to identify the triggers for asthma.

B) to describe to doctors new treatments for asthma.

C) to inform readers about the causes, effects, and treatments of asthma.
D) to persuade researchers to continue seeking new information about the causes of asthma.
Which one is it foreal

this is the sentence that best shows that fast food restaurants are designed for using unskilled labor. 

ian mortimer in his book "the time traveller's guide to elizabethan england" uses a narrative in his style, which successfully conveys a clear description of the life in england in the 16th century. he writes in second person, which makes it comfortable to reader and easy to understand, he captures the readers attention with views of the landscape, the streets, the people including rich and poor. he also depicts some cultural traits from how people behave, eat or what they wear. his descriptions range from the social, economical, the political power to the examples of the life of common people. it could be tell that this book is about social history rather than a   novel.

i don't understand your question,is there answer choices?