Plant species differ in that renewed growth in spring can be triggered by day length or by temperature or else by a combination of both. Day length is the same, year after year, for any given date. Ttherefore, any plant species that starts to grow again on widely different dates in different years resumes growth at least in part in response to temperature. Which one of the following arguments is most similar in its pattern of reasoning to the argument above? ['In Xandia, medical assistant trainees must either complete a formal training course or work for one year under the close supervision of a physician. Since few physicians are willing to act as supervisors, it must be true that most medical assistant trainees in Xandia take the training course.', 'Depending on volume of business, either one or two or three store detectives are needed for adequate protection against shoplifting. Ttherefore, if on any particular day store management has decided that three detectives will be needed, it must be because business that day is expected to be heavy.', 'Some landfills charge garbage companies by volume only, some charge by weight only, and all others use a formula sensitive to both volume and weight. So if at a particular landfill the charges for two particular loads of equal volume dumped on the same day are different, weight must determine, or help determine, charges at that landfill.', 'In the Crawford area, easterly winds mean rain will come and westerly winds mean dry weather will come; winds from other directions do not occur. Ttherefore, since it is currently raining in Crawford, there must be an easterly wind blowing there now.']