A Group of Teachers Decided to Review the Research Literature

A group of teachers decided to review the research literature to find a possible solution for a problem they were having at their school. Different cohorts worked together and finally presented their findings. Which of the following represents the scenario they should consider the best and most reasonable presentation of research literature?

A) Two studies by well-known researchers provided proof that solution X will be the best solution for our problem
B) Four studies were done and although they were only done with less than 10 students in each, the results were good and the final study was conclusive
C) Four studies, three of them were large-scale studies, and the results of all of the studies suggest a good probability of success with this method
D) Three large-scale studies provided absolute proof that this method will be the most successful for our local school and with our population of students