Answer: Greenhouse
Step-by-step explanation:
According to the question, Fiona should choose to work in greenhouse being a plant scientist. Greenhouse consist of glass infrastructures inside which plant are grown and maintained. Greenhouse are warm from inside in most weathers e.g.-winters . Thus, varying season will not manipulate her research
Other options are incorrect because garden,nursery and park reserves are not the place for working for Fiona's research.Thus, the correct option is greenhouse.