Concept:FIACS (Flanders Interaction Analysis Categories System) is a classroom observation tool developed by Ned A. Flander to analyze teacher-student verbal interaction.Explanation:Dr. Ned A. Flander created FIACS in the 1960s. It records classroom events into ten categories. The system focuses only on verbal behaviour. It helps measure how a teacher influences students. Categories are grouped into three sections: Teacher-talk, Student-talk, and Silence/Confusion. Teacher-talk has two types: indirect influence (accepting feelings, praising, accepting ideas, asking questions) and direct influence (lecturing, giving directions, criticizing). Student-talk includes responding and initiating. The last category covers pauses or confusion. This system is widely used in educational research. Hence, the person linked with FIACS is Flander.Answer:Option A. Flander