Answer:
c. in subtle and complex ways that they could not identify.
Step-by-step explanation:
The word "bloomer" is used to describe a small error that does not have a big impact on anyone's life. Based on this, some teachers called "academic bloomers, those students who had small and harmless learning errors, which were not so serious and could be fixed with time and dedication. For this reason, these teachers used to communicate with these students, showing that they had expectations that they would improve academically. This communication was done in a subtle way and, at times, so complex that the researchers of the study shown above, were unable to identify. However, the communication showed good results, since the " academic bloomers "have improved their test scores over the course of an academic year.