Which indicator from a videotaped lesson will best assess a teacher's role in students' learning?

Which indicator from a videotaped lesson will best assess a teacher's role in students' learning?

A.     How students adjust their performance and or behavior after the teacher addresses them

B.     How she addresses students with special needs

C.     How many times she speaks to the same child about performance and or behavior

D.     How many students are actively involved during the class?