Tasa Is a Primary Grade Teacher in a Rural School

Tasa is a primary grade teacher in a rural school district. She and the other teachers have found that after kindergarten there are large differences among the rising first grade students. Some are reading and writing well and others are still 'catching up'. Tasa would like to investigate this further.
-Tasa' s issue is appropriate for an action research study because

A) the study involves something Tasa would like to change.
B) the study should not cost too much to conduct.
C) administrators and policy makers will support the study.
D) there is a body of relevant related empirical research.