They ____ extensive research on the environmental effects of using fake Christmas trees. 

Mark the letter A, B, C, or D on your answer sheet to indicate the correct arrangement of the sentences to make a meaningful paragraph/letter in each of the following questions

a. Reusing and recycling single-use plastics will lead to a greener school environment and help promote a green lifestyle among young people.

b. Third, we recommend that we make use of plastic waste in arts and crafts projects, for example, for making plant pots or bird feeders.

c. Second, the Youth Union should hold regular sessions to teach students how to recycle properly.

d. This report suggests three main solutions to the problem of single-use products in our school.

e. First, we suggest that the school should provide more recycling bins.