Who Are Lupart and Pyryt Referring to in Their Description

Multiple Choice

Who are Lupart and Pyryt referring to in their description of the "hidden gifted"

A)  Those who have genius-level IQs and remove themselves from social interactions. 
B)  Children who may be gifted but have not yet been psychologically tested. 
C)  Children with high levels of intelligence who underperform for a variety of reasons. 
D)  Children whose intelligence is undetected because they refuse to participate in scholastic activities.